When rewinding a video, the time in the links Watch on Youtube, (Embed), Switch Invidious Instance, Embed Link was not rewound, so the time in the links only increased and it didn't decrease depending of the video playback timestamp position.

If it's not clear, here is a video of the fix, trying to rewind without this fix, makes the t parameter only increase.

This fix does not affect at all with the saved playback position of each video (Save playback position: preference in Invidious settings that saves the video playback positions in Local Storage), the timeupdate_last_ts was only used here.