I'm having the same issue.
Once there are a lot of changes the "Show revision clouds of latest revision only" doesn't seem to work anymore...
Only show all / show none seems to work. But I noticed that many times when a layout has some changes that it should not have in the current issue (because they are archived for example), then when those changes are manually deleted from the layout, then even the show all/none revision clouds ceases to work...
Mac OSX 13.6.6 | AC 27 INT 5003 FULL