I haven't much to add to this discussion where I'm being Cc'ed except that I generally agree with Stefan's stance and fix and that I am fairly sure this has always a problem before Stefan's track-changes.el framework, only that we did not know about it because the raw usage eglot.el made of b-c-f and a-c-f didn't sanity-check anything. You just got subtly wrong server behaviour because it was being misinformed, and ended up reconnecting to fix these things.