No location provided (how to debug)

Unfortunately I can't get the location backend to work and I'm a bit lost to find the reason. I've installed the latest UnifiedNlp (GAPPS Version, since I've playstore installed), the XposedUnifiedNlp Module and the IchnaeaNlpBackend 1.4.0 configured and activated. According to the SelfTest everything is in order and should work but "No UnifiedNlp location was provided by the system within 10 seconds".

Now I'm a bit lost on how to find the problem. There is no error message and logcat doesn't show any related errors. Are there any other ways to debug this problem? Or is this a known behaviour?

Im using Lineage 16.0 on an Sony Xperia XZ1Compact

No source files or tests are named. Start by reproducing the configured UnifiedNlp, XposedUnifiedNlp, and IchnaeaNlpBackend setup on Lineage 16.0, then inspect the SelfTest result and logcat; done would require identifying why no location is delivered or documenting the missing diagnostic.

Written by the indexing model from the issue text.