Meeting Participant User ID value

Description
I am using Get Meeting Participants Reports to get participant data from Zoom meetings via their meetinguuid.
I was looking for further documentation on user id which I have assumed would fit the formatting of int64 or bigint (or even a varchar of length eight).

What I know from the given documentation under the participants array is it is a locally unique identity attribute and (I assume) could return null or different results if the user was a ‘guest’ (not a Zoom user under the associated account)

Error
For one meeting (MeetingUUID = ‘KLp6/dd/SFaDAHW5j4a4vQ==’) the result contains three participants with a datetime added to the end of the userid (see screenshot).
I was wondering if there was further information or a case to this as I have not encountered this with any other meetings

Which App Type (OAuth / Chatbot / JWT / Webhook)?
JWT

Which Endpoint/s?
https://api.zoom.us/v2/report/meetings/KLp6%2Fdd%2FSFaDAHW5j4a4vQ%3D%3D/participants?page_size=300
(I double encoded the meeting UUID)

Screenshots (If applicable)
Result:

Hey @alastair.chin, thanks for the detailed post!

Although rare, I have seen this issue before:

We will look into this and get back to you with an update. (ZOOM-112804)

Thanks,
Tommy