[2021.3.15] Users need to alt-tab in and out of Unity after dependency packages have been added to get rid off Compile errors

[SixParQuatre]

Users need to alt-tab out/in of Unity after dependency packages have been added to get rid off Compile errors.

To Reproduce
Add a package A with dependencies to package B.
Wait for the package A to have been downloaded and B to have been clone.
Notice that the console shows an error of some code in A not finding references to thing in B.
Interact with the rest of Unity and see the error remaining.
Alt-tab out/in of Unity and notice the compiling/refresh bar; and see that the error goes away.

Expected behavior
Unity should auto-refresh without user intervention after the dependency packages have been added.

Environment (please complete the following information):

• Version 2.0.0
• Platform: Editor Windows
• Unity version: 2021.3.15f1 (I suspect this regressed with an earlier version)
• Build options: [e.g. IL2CPP, .Net 4.x, LWRP]

Additional context

[Doppelkeks]

@SixParQuatre I believe this project to be abandoned. I started a new one with a sligthly different approach by harnessing the new package manager API, which has the nice benefit that it does not suffer from the described issue. You can take a look at it here: https://github.com/Gentlymad-Studios/PackageManagerTools. Please be aware that this might be too specific or tied to github at the moment, but maybe it helps.