@d-healey I think you are right. I managed to solve the problem this way:
I created a folder in "Applications" where I moved both my HISE folder and my Project Folder.
I created a root user and logged into it (
https://support.apple.com/en-us/HT204012)
I exported my vst.
It worked fine but instead of having an exported vst file in my project's folder I found there a copy of it. I clicked to show info of this file and it said the original VST is located here: /private/var/root/Library/Audio/Plug-Ins/VST3/"my plugin name".vst3
Screenshot 2022-11-30 at 14.58.15.png
So I used that one and inserted to where all my other VSTs are and it worked fine.