Pool settings aren't populated to OSD after restart.
In vstart-ed cluster kill osd then restart using ceph-osd -i N
Restarted OSD doesn't observe pool settings (e.g. bluestore_compression_mode) until one invokes "ceph osd pool set" command. Target pool for the command may be different from the pool we want settings for.
Reproduced this in the lab against both master and mimic.
See #40480 for an additional example.