Log count number doesn't increment for auto restart?

[MetRonnie]

I think the log count number might not be 100% airtight, got this situation while running tests/functional/restart/34-auto-restart-basic.t:

01-start-01.log
02-start-01.log
02-restart-02.log
03-restart-02.log

(sorted by creation time ascending)

When I re-ran it passed, but this shouldn't be flaky

Originally posted by @MetRonnie in https://github.com/cylc/cylc-flow/issues/4836#issuecomment-1156767719