Terraform doesn't pick up one certain variable change - terraform

Question

I have an ECS Fargate cluster set up that currently has 4 tasks of the same app running on it. The desired number of tasks is defined within a variable:
variable "desired_task_count" {
description = "Desired ECS tasks to run in service"
default = 4
}
When I change the default value to any given number, save it and run terraform plan or terraform apply, terraform doesn't see any changes. The tfstate file remains unchanged.
No changes. Your infrastructure matches the configuration.
Terraform has compared your real infrastructure against your configuration and found
no differences, so no changes are needed.
Apply complete! Resources: 0 added, 0 changed, 0 destroyed.
TFstate:
"desired_count": 4,
If I change any other variable in that exact same variables.tf file, terraform picks up the changes and applies them.
What I tried to do:
Create a new variable to pass the value - didn't work
Rebuild infrastructure with destroy and then apply. This did work as it rewrites a new state file.
TF and provider versions:
terraform --version
Terraform v1.2.4
on linux_amd64
+ provider registry.terraform.io/hashicorp/aws v3.75.2
Could this be a provider issue? It seems like the problem only occurs with a viariable that points to a specific setting in a specific resource.
What else can I check?
SOLVED:
There was a lifecycle block in the ECS resource that contained a list of change ignores. It was there because of autoscaling, which was temporarily removed from the project.
lifecycle {
ignore_changes = [task_definition, desired_count]
}