Okay, I ran into the same issue today on Windows 10.
I’ve uninstalled VSC, deleted .platformio and .vscode from my user directory. I deleted .vscode and .pio from my project directory. I’ve reinstalled VSC x64 1.40.2 (System setup). Reinstalled PlatformIO, opened my project folder in VSC and… still got the isse
I’ve then installed VSC on an other Windows 10 PC, copied my project, installed PIO and the tasks worked fine.
I may have also clicked the disable typescript button…
How do I solve the issue? Downgrading is not an option…
One more thing, maybe related. At least, disappearing-tasks problem appeared when ms-vscode.cpptools extension self-switched to “insiders” channel (maybe, i clicked “update”, but not sure, anyway - ms-vscode.cpptools want to switch to “insiders”, because when i switched it back to “default” it ask me to swith to “insiders” again, but i have rejected, of course).
And, seems like, this “insiders” “damaged” something else (inluding build tasks of PIO)
I’m new to platformio, it showed me some message that auto tasks is slowing your system, click here to turn off auto tasks, some notification like that, so I think issue appeared after I clicked that button.
God damn M$… Present people with a “Would you like your computer to stop working?” button and of course they’ll click ‘Yes’ so it goes away! Where was the “If you don’t know what an auto task is, you probably shouldn’t be clicking this button?” warning label?