I’ve had luck with changing resolution. The default setting for Invidious, 720p, seems to often be encoded in WebM (the others usually in MPEG-4), which might be the reason why it’s causing more problems. Similarly, I’ve heard others suggest setting the resolution to “dash” to fix these kinds of problems.

Ah, I did not try changing resolutions yet. Will keep this workaround in mind the next time I encounter an unplayable video. Thanks!