I believe that I finally managed to track down the annoying element cache bug that is linked to editing plain lists. It has been reported a number of times, but it is hard to reproduce. Recently, Jason Terk has managed to record detailed logs of what is hapenning when the bug is trigerred, and I think the reason is related to successive edits coming between cache syncs. Now, if we confirm that https://list.orgmode.org/orgmode/CAKcq1chJuVKb7C=vYWN9jwKa=Yr_SC6x9S3Mq04TH0jGgjkriw@mail.gmail.com/ really works, it should hopefully eliminate one of the last cache bugs.