This is why not to use string interpolation...

variables_bad2.tf

terraform {
  required_version = ">= 1.1.6"
}

locals {
  my_var = "12\" = 1'"
}

resource "null_resource" "bad_example" {
  triggers = {
    my_var     = local.my_var
    always_run = "${timestamp()}"
  }

  provisioner "local-exec" {
    interpreter = ["Powershell", "-Command"]
    command     = <<EOC
      write-host "my_var value: ${local.my_var}"
    EOC
  }
}