Assembly not closing properly after reopening in ILSpy

[DevX-Cipher]

Description:
When I open an assembly in ILSpy, clear it, and then try reopening the same assembly, the previous assembly is not properly closed,

[siegfriedpammer]

More info:

I’ve noticed a potential bug and wanted to bring it to your attention. When right-clicking on a DLL or EXE, it opens as expected. However, if you go to File → Clear Assembly List and then open a new DLL or EXE, the previously opened assemblies still appear, even though they were supposedly cleared.

Would you like me to create a new issue for this? Let me know.

Originally posted by @modz2014 in #3395