This issue was not introduced with todays patch and is instead a very rare (and evasive) issue that has been happening for a little while.
The 'hit registration' fixes that were introduced with this patch is something very specific to address the issue of rubberbanding during moments of melee/dodging, as indicated in the patch notes;
Made improvements to resolve issues with hit registration, despite dodging Lightsaber and melee attacks.
I understand that when 'hit registration' is discussed alongside 'fixes', these often aren't to the level of expectation within the community. We will continue to address and work on that area as we go along.
Back to the subject of this clip though, we are on the lookout for more footage/instances of this happening - if you feel it has happened to you, please do let us know by submitting a bug report via AnswersHQ and include any footage that you can on it!
Sorry for the inconvenience caused,
Roger, Roger.