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From BF-44855:

The issue time line is:

Leader insert an indent
- Follower replay oplog
Leader create checkpoint
- Follower advance this checkpoint
! Follower restart triggered (or other actions that clears the ingest table)
- Follower's ingest table is cleared, but it skipped the stable table simply returns WT_NOTFOUND
- In this scenario, the removed key will remain visible on the follower
  - Now leader don't have the key, but follower has the key.
Leader delete a key and succeeded
- Follower delete the same key but returned not found, then issue poped out.

is related to

WT-17247 Layered cursor writes on follower should check for potential write conflicts

WT-17254 Require a caller-guaranteed live key for overwrite=true remove on a layered follower cursor

WT-18159 Lazily open the stable table on follower