[newbie] Can't analyse my library in full - only album by album works

[FlavioB79]

Hi
I imported my library with
docker exec -it beets beet import -A -W -C -i /music

Then I ran
docker exec -it beets beet replaygain -a -f

While it was running, I could see "replaygain: analyzing" and album names. I picked one of the albums it had apparently already analysed, threw it into MusicBrainz Picard and there were NO ReplayGain tags :-(
Running the replaygain CLI only on one album at a time, it works though

How to fix this?
TIA,
F.