FreeRTOS Shared pointer parameter set to 0 - c++

Question

I am trying to share data between 2 FreeRTOS tasks. My approach for this is to create a struct for the tasks' pvParameters that contains a std::shared_pointer.
My task creation looks like this:
auto shared_value = std::make_shared<int8_t>(-1);
auto paramsA = SharedValParams(shared_value);
xTaskCreate(taskA,
"Task A",
4000,
(void *)&paramsA ,
1,
NULL);
auto paramsB = SharedValParams(shared_value);
xTaskCreate(taskB,
"Task B",
4000,
(void *)&paramsB,
1,
NULL);
I'm currently trying to modify this value
void taskA(void *params)
{
for (;;)
{
*((SharedValParams*)params)->shared_val= 5;
Serial.printf("Shared val is now %d\n",
*(*(SharedValParams*)params).shared_val.get());
vTaskDelay(1000/ portTICK_PERIOD_MS);
}
}
The first couple executions of taskA, shared_val is printed as 5. Great! However, after this shared_val is set to 0, or at least that's what is being printed. I've yet to implement this in taskB, so nothing else accesses or modifies shared_val. I'm unsure as to why this is happening, especially when the default value of shared_val is -1.
In the future once I resolve this issue, I will surround shared_val in a mutex, but for now, I cannot reliably set the value. The motivation behind passing this as a param, is to keep the value scoped between relevant tasks.