lol…
When I’ve seen it it’s because of something else that happened that was ‘serious’, like files not linked properly or failed iZotope RX transfers. I typically don’t have time to mess around with this stuff when I’m in the middle of working so I just bounce the event to a new file (assuming the edits are good) and that regenerates the waveform display for that (new) event. Waste of space, somewhat annoying, but faster than troubleshooting it. I haven’t found anything about regenerating waveforms so… please share if you find that.