Two instances of task launched after reloading

[roblourens]

I see this in the vscode-jupyter repo with their "Compile" task but it is not fancy so probably a general issue

• Start the Compile task
• Reload the window
• Start debugging, which has "preLaunchTask": "Compile",
• Now there are two instances of the Compile task running

[meganrogge]

probably fixed by #158298, so should be fixed in tomorrow's insider's. pls reopen if not