Rstudio Crashes after I close the shiny app (using "pool" package) - shiny

Question

I basically have an shiny app like in this example:
library(shiny)
library(DBI)
library(pool)
# create the connection
pool <- dbPool(
drv = RMySQL::MySQL(),
dbname = "shinydemo",
host = "shiny-demo.csa7qlmguqrf.us-east-1.rds.amazonaws.com",
username = "guest",
password = "guest"
)
onStop(function() {
message("closing...")
pool::poolClose(pool)
})
# === UI ====
ui <- fluidPage(
textInput("ID", "Enter your ID:", "5"),
tableOutput("tbl"),
numericInput("nrows", "How many cities to show?", 10),
plotOutput("popPlot")
)
#==== SERVER ====
server <- function(input, output, session) {
output$tbl <- renderTable({
sql <- "SELECT * FROM City WHERE ID = ?id;"
query <- sqlInterpolate(pool, sql, id = input$ID)
dbGetQuery(pool, query)
})
output$popPlot <- renderPlot({
query <- paste0("SELECT * FROM City LIMIT ",
as.integer(input$nrows)[1], ";")
df <- dbGetQuery(pool, query)
pop <- df$Population
names(pop) <- df$Name
barplot(pop)
})
}
#=== Run the App====
shinyApp(ui, server)
And the error has been already asked in this post years ago, but the answer does not solve the issue on my side. (they suggest to get the latest "later" package, but I did and the error remains).
So the error is that: once I click on the Stop bottom on my RStudio Server Session (to stop the shiny App dashboard that runs fine) it does not stop. Instead, a window pop-out appears saying: Terminate R (And no message error appears in the console)
I tried for hours to solve this annoyin behaviour (it makes me recall the system environment variables everytime I restart the Rstudio session) and I found a temporal solution: pressing "Esc" button on the "Console", to Stop the process, avoiding that "Terminate R" pop-out. Then it really stops and I can rerun again the Shiny app. I want to remark that the "Stop" icon (see circle in red, on the attached picture)does not work properly. The "Esc" works instead.
Anybody knows why is this happening? I will also report it in GitHub "pool" issues. Although I am not completely sure if the issue is from the package.
I am using R.4.1.0 (also my connection is to Postgress using a odbc driver, but is not displayed in the code. My session is running in RStudio Workbench 2021.092 (Build 382.pro1). I am ussing "pool" v.0.1.6.