This was tested on a clean install of Delphi 11 with November Patch and no 3rd party packages.
Firstly I have noticed that Delphi 11 does not do Find Declaration while your project's Release build is activated. I did find a similar bug report on Quality Portal and voted for that as well as have my colleague submit a comment how to reproduce our issue.
https://quality.embarcadero.com/browse/RSP-33347
So I am wondering if my next Delphi 11 issue is related to that or maybe I am just missing something. Attached you will find a .zip file containing a bare minimum Package and an Application.
In the application the problem is that I cannot do a Find Declaration on the package unit in the uses section or the DoMsg method unless I enable "use debug .dcus" inside the application Debug build config.
The package consists only of the TestUnitJ unit and the IDE Paths were setup as follows:
Win32--------
Library Path--
D:\Test Package\DCU\Win32\Release
Browsing Path--
D:\Test Package\PAS
Debug DCU Path--
D:\Test Package\DCU\Win32\Debug
I followed the same pattern as I have always done in previous versions of Delphi without having these issues.
Test Package and Application.zip