Hello Alexander,
it seems your component startup misses to initialize all modules correctly. While I have no idea where this stems from I have two options to proceed. First, I suggest a closer look into the changes in [1] that cleans up shared library initialization. The alternative is to use "git bisect" (maybe starting with [1]) to find the offending change in Genode 20.05.
As you have your own linker command sampled with an earlier release it only makes sense to test with your tree except you are able to isolate the issue with a minimal patch and without Go.
[1] https://github.com/chelmuth/genode/commit/42fddf8390c0436a09cf6fae3391f9a260...
Regards