Concat in Arrayformula using row numbers - if-statement

Question

UPDATE - Modified answer
With help from #player0, found solution that handled line seperators too:
=ARRAYFORMULA(REGEXREPLACE(TRANSPOSE(QUERY(TRANSPOSE(SPLIT(TRANSPOSE(SPLIT(QUERY( IF(D1:D="[task]", "♦"&D1:D, "♣♀"&D1:D),,999^99), "♦", )), "♀")),,999^99)),"\s*♣\s*",char(10)))
This moves each [task] section into its own cell, retaining all other formatting, and stops the extra whitespace that gets added around each cells content that are joined/concat together.
Original Post
Can't seem to find anywhere else this is done, so happy for any links in comments too :)
I have a column of text, the contents of over a hundred files with [task] at top of each.
More than 50,000 characters, so they pasted into a newline each cell ('paste as values').
I can easily tell the row numbers to work with and have a draggable working formula, just can't get it properly ARRAYFORMULA capable, since the input might change by easily a thousand rows so needs to handle that gracefully.
Formulas only please, no code
Example Spreadsheet
https://docs.google.com/spreadsheets/d/1yaETa3Pvq47DpcAyojSlf6p5N1Tt_hpvoqp7WEtC6pI/edit?usp=sharing
Example Input (50,000+ characters)
https://drive.google.com/file/d/1sMl0ZQfbXZUjpB0fic2VkX5Ze5H_IEGL/view?usp=sharing
Note - if the input file is removed when I clean my drive up, just copy-paste the sample below till 50,000+ characters, or see linked spreadsheet
Input
[task]
SpriteNE = floor_metal_01.dds
SpriteSE = floor_metal_01.dds
SpriteSW = floor_metal_01.dds
SpriteNW = floor_metal_01.dds
guilevel = 1
guiindex = 10
type = COMPONENT
locked = 0
name = category_advanced_manufacturing
parent
[task]
SpriteNE = floor_metal_01.dds
SpriteSE = floor_metal_01.dds
SpriteSW = floor_metal_01.dds
SpriteNW = floor_metal_01.dds
guilevel = 1
guiindex = 9
type = COMPONENT
locked = 0
name = category_facilities
parent
[task]
tilelable
SpriteNE = conveyor_NE.dds
SpriteSE = conveyor_SE.dds
SpriteSW = conveyor_SW.dds
SpriteNW = conveyor_NW.dds
exitdirectionoffsets = 0
inputdirectionoffsets = 2
guilevel = 1
parent
guiindex = 0.5
name = task_conveyor
is_conveyor = 1
[components]
[resources]
[subtasksrequired]
[subtasksapplied]
[tile]
texture = conveyor_SE.dds
[task]
tilelable
SpriteNE = conveyor_converge3_NE.dds
SpriteSE = conveyor_converge3_SE.dds
SpriteSW = conveyor_converge3_SW.dds
SpriteNW = conveyor_converge3_NW.dds
exitdirectionoffsets = 0,
inputdirectionoffsets = 1,2,3
guilevel = -1
parent
guiindex = 1
name = task_conveyor_converge3
is_conveyor = 1
[components]
[resources]
[subtasksrequired]
[subtasksapplied]
[tile]
texture = conveyor_converge3_SE.dds
[task]
tilelable
SpriteNE = conveyor_crossover_NE.dds
SpriteSE = conveyor_crossover_SE.dds
SpriteSW = conveyor_crossover_SW.dds
SpriteNW = conveyor_crossover_NW.dds
exitdirectionoffsets = 0,3
inputdirectionoffsets = 1,2
guilevel = -1
parent
guiindex = 1
name = task_conveyor_crossover
is_conveyor = 1
[components]
[resources]
[subtasksrequired]
[subtasksapplied]
[tile]
texture = conveyor_crossover_SE.dds
[task]
tilelable
SpriteNE = conveyor_left_NE.dds
SpriteSE = conveyor_left_SE.dds
SpriteSW = conveyor_left_SW.dds
SpriteNW = conveyor_left_NW.dds
exitdirectionoffsets = 3
inputdirectionoffsets = 2
guilevel = -1
parent
guiindex = 1
name = task_conveyor_left
is_conveyor = 1
[components]
[resources]
[subtasksrequired]
[subtasksapplied]
[tile]
texture = conveyor_left_SE.dds
[task]
tilelable
SpriteNE = conveyor_right_NE.dds
SpriteSE = conveyor_right_SE.dds
SpriteSW = conveyor_right_SW.dds
SpriteNW = conveyor_right_NW.dds
exitdirectionoffsets = 1
inputdirectionoffsets = 2
guilevel = -1
parent
guiindex = 1
name = task_conveyor_right
is_conveyor = 1
[components]
[resources]
[subtasksrequired]
[subtasksapplied]
[tile]
texture = conveyor_right_SE.dds
[task]
tilelable
SpriteNE = conveyor_split3_NE.dds
SpriteSE = conveyor_split3_SE.dds
SpriteSW = conveyor_split3_SW.dds
SpriteNW = conveyor_split3_NW.dds
exitdirectionoffsets = 0,1,3
inputdirectionoffsets = 2
guilevel = -1
parent
guiindex = 1
name = task_conveyor_split3
is_conveyor = 1
[components]
[resources]
[subtasksrequired]
[subtasksapplied]
[tile]
texture = conveyor_split3_SE.dds
[task]
tilelable
SpriteNE = conveyor_t_NE.dds
SpriteSE = conveyor_t_SE.dds
SpriteSW = conveyor_t_SW.dds
SpriteNW = conveyor_t_NW.dds
exitdirectionoffsets = 3,1
inputdirectionoffsets = 2
guilevel = -1
parent
guiindex = 1
name = task_conveyor_t
is_conveyor = 1
[components]
[resources]
[subtasksrequired]
[subtasksapplied]
[tile]
texture = conveyor_t_SE.dds
[task]
tilelable
SpriteNE = conveyor_t_join_NE.dds
SpriteSE = conveyor_t_join_SE.dds
SpriteSW = conveyor_t_join_SW.dds
SpriteNW = conveyor_t_join_NW.dds
exitdirectionoffsets = 0
inputdirectionoffsets = 1,3
guilevel = -1
parent
guiindex = 1
name = task_conveyor_t_join
is_conveyor = 1
[components]
[resources]
[subtasksrequired]
[subtasksapplied]
[tile]
texture = conveyor_t_join_SE.dds
[task]
tilelable
SpriteNE = conveyor_t_join_left_NE.dds
SpriteSE = conveyor_t_join_left_SE.dds
SpriteSW = conveyor_t_join_left_SW.dds
SpriteNW = conveyor_t_join_left_NW.dds
exitdirectionoffsets = 0
inputdirectionoffsets = 2,3
guilevel = -1
parent
guiindex = 1
name = task_conveyor_t_join_left
is_conveyor = 1
[components]
[resources]
[subtasksrequired]
[subtasksapplied]
[tile]
texture = conveyor_t_join_left_SE.dds
[task]
tilelable
SpriteNE = conveyor_t_join_right_NE.dds
SpriteSE = conveyor_t_join_right_SE.dds
SpriteSW = conveyor_t_join_right_SW.dds
SpriteNW = conveyor_t_join_right_NW.dds
exitdirectionoffsets = 0
inputdirectionoffsets = 1,2
guilevel = -1
parent
guiindex = 1
name = task_conveyor_t_join_right
is_conveyor = 1
[components]
[resources]
[subtasksrequired]
[subtasksapplied]
[tile]
texture = conveyor_t_join_right_SE.dds
[task]
tilelable
SpriteNE = conveyor_t_left_NE.dds
SpriteSE = conveyor_t_left_SE.dds
SpriteSW = conveyor_t_left_SW.dds
SpriteNW = conveyor_t_left_NW.dds
exitdirectionoffsets = 0,3
inputdirectionoffsets = 2
guilevel = -1
parent
guiindex = 1
name = task_conveyor_t_left
is_conveyor = 1
[components]
[resources]
[subtasksrequired]
[subtasksapplied]
[tile]
texture = conveyor_t_left_SE.dds
[task]
tilelable
SpriteNE = conveyor_t_right_NE.dds
SpriteSE = conveyor_t_right_SE.dds
SpriteSW = conveyor_t_right_SW.dds
SpriteNW = conveyor_t_right_NW.dds
exitdirectionoffsets = 0,1
inputdirectionoffsets = 2
guilevel = -1
parent
guiindex = 1
name = task_conveyor_t_right
is_conveyor = 1
[components]
[resources]
[subtasksrequired]
[subtasksapplied]
[tile]
texture = conveyor_t_right_SE.dds
Desired Output
Each [task].* is a new file, so seperate by those into one cell each in a single column, with newlines (\n) as internal separators.
In other words, everything after [task] till the next [task] (or end of column, if no more [task]) combined into one cell each.
Just has to be arrayformula able and avoid the char limit for functions like concat of 50,000 characters.
Current Output
Getting row numbers
$D$1:D is the input column
$G$1 is dropdown with "[task]" selected
$M$1 =ARRAYFORMULA(QUERY({$D1:$D, row($D1:$D)},"select * where Col1 = '"&$G$1&"'"))
$O$1 =ARRAYFORMULA(QUERY({$M1:$M,{$M2:$M;0}},"select *"))
Then some of my attempts to use these numbers
Works, has to be dragged through, and doesn't have any separators.
=ARRAYFORMULA(CONCATENATE(INDIRECT("$D"&$O1:$O&":$D"&$P1:$P-1)))
Doesn't work, I kept adding more arrayformula but still just first result
=ARRAYFORMULA(IF($P1:P<>"",CONCATENATE(ARRAYFORMULA(INDIRECT("$D"&ARRAYFORMULA(INDIRECT("$O"&IF($P1:$P<>"",row($P1:$P),"")&":$O"))&":$D"&ARRAYFORMULA(INDIRECT("$P"&IF($P1:$P<>"",row($P1:$P),"")&":$P"))-1))),""))
Just the string used in previous INDIRECT
=ARRAYFORMULA(IF($O1:O<>"","$D"&ARRAYFORMULA(INDIRECT("$O"&IF($P1:$P<>"",row($P1:$P),"")&":$O"))&":$D"&ARRAYFORMULA(INDIRECT("$P"&IF($P1:$P<>"",row($P1:$P),"")&":$P"))-1,""))
Doesn't work, has separators but still only looping the first result.
$U1:U is the string list for indirects (see above)
=ARRAYFORMULA(IF($U1:U<>"",TEXTJOIN(";",FALSE,INDIRECT($U1:U)),""))
There are some other formulas in the example sheet, I mostly removed the duds as I kept going though.
I found lots of interesting resources out there but nothing that seemed to target using row numbers, or even just SPLIT + JOIN type approach that allowed ARRAYFORMULA (AND avoided the 50,000 character limit issue with single CONCAT or similar calls).

Answer 1

try:
=ARRAYFORMULA(SPLIT(TRANSPOSE(SPLIT(QUERY(
IF(A2:A="[task]", "♦"&A2:A, "♀"&A2:A),,999^99), "♦", )), "♀"))

Answer 2

This is sample as I said before in comment, you just call function in cell "=GroupMacro" unfortunately, this can't be auto refresh:
var rtrn=[];
var rslt=[];
var rslt2='';
function GroupMacro() {
var spreadsheet = SpreadsheetApp.getActive();
var bomo=spreadsheet.getRange('D1:D' + spreadsheet.getLastRow()).getValues();
for (a=0; a<bomo.length; a++)
{
if(bomo[a]=='test') //this is separator, this can be applied as parameter in function
{
if(a>0)
{
rslt2=rslt.join();
rtrn.push(rslt2);
rslt=[];
}
rslt.push(bomo[a]);
}
else
{
rslt.push(bomo[a]);
}
}
rslt2=rslt.join();
rtrn.push(rslt2);
return rtrn;
};