You'll notice
Useful4 Signal1
Quitting right after a turn no longer loses your last history entry.
What's wrong with this entry?
Anonymous. No account, no email.
What
Both the periodic history flush and the flush on exit now wait for every pending write to finish before returning, so quitting immediately after a turn cannot drop the last entry.
Evidence
history_save_exit_flush_failed
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.