I have a VSIX solution in VS 2019 targeting 2015, 2017, and 2019. The solution builds fine, and I can install it manually using the .vsix file. It installs fine on all targeted versions of VS.
But, when I try to debug it in VS2019 targeting 2015 or 2017, the experimental instance of the target version opens up but the extension is not installed on it!
I searched on google for days, and I can't find anything!