Scrub stuck and 'pg has invalid (post-split) stat'

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Following an upgrade from Nautilus (14.2.22) to Pacific (16.2.13), we
encounter an issue with a cache pool becoming completely stuck,
relevant messages below:

pg xx.x has invalid (post-split) stats; must scrub before tier agent
can activate

In OSD logs, scrubs are starting in a loop without succeeding for all
pg of this pool.

What we already tried without luck so far:

- shutdown / restart OSD
- rebalance pg between OSD
- raise the memory on OSD
- repeer PG

Any idea what is causing this? any help will be greatly appreciated


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