I have been noticing some odd results using the Wikidata plugin that I couldn’t explain.
So I tried to narrow it down by doing a lot of testing, and there is one issue that has come to light:
It seems related to the ‘use Artist genres only if no Release Group exists’ setting.
Here are two releases that clearly show the issue:
https://musicbrainz.org/release/009b20dd-887d-4be6-a5d5-81949b32b254?tport=8000
https://musicbrainz.org/release/1bdbcc97-2eb5-434b-b948-91948980fc7f?tport=8000
When running each release separately, these are the results:
But when running them both I get these results for the second one:
So it looks like it gets all artist genres added, while ‘Use artist genres only if…’ is checked.
So somehow the processes seem not completely isolated between the releases, and they can ‘contaminate’ each other?
settings:
edit:
Perhaps I should ping @ the creators of the Wikidata plugin in this post?
But I don’t know what avatar/alias to use for that?
(ah well, I’ll just rely on @outsidecontext 
)