(Bug) Videos skipping 5 seconds ahead, even if there are no SponsorBlock segments associated with it

[raw-binary]

I've had an issue on Desktop for a few months now that happens whenever SponsorBlock is enabled. On some random videos, there is a chance that the video skips forward by 5 seconds, usually happening near the start of the video. There are no SponsorBlock segments associated to those sections whatsoever, and their content is normal and doesn't warrant skipping. It even happens on videos that don't have any marked segments at all.
What's annoying is that attempting to rewind back 5 seconds to the section it skipped will usually result in the video freezing on that timestamp and not buffer at all (or get stuck in an infinite loading cycle), or just skip ahead 5 seconds anyway.

[ajayyy]

Are you sure this is not YouTube remembering your last playback position?

[raw-binary]

I'm sure. It happens on videos that I have not watched before.

[WD40andTape]

I can confirm this bug. Sometimes it won't happen for a week, and sometimes it'll break the whole Youtube experience and I'm forced to disable the addon.

Let me know how I can help collect debugging information next time it occurs. Firefox 125.0.3 64-bit, Windows 11 Pro 64-bit Version 10.0.22631 Build 22631.