While in spectator mode, if you hold number 9 on the keyboard some spectator options will flash open and closed, like it does while holding F5, the inventory button etc. However, unlike those holding nine in spectator will continue doing the action after it is unpressed. The amount of time it continues depends on how long you were holding the button in.
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I can reproduce this bug, very strange one at that.
Thank you for your report!
We're actually already tracking this issue in MC-118107, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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I cannot reproduce this bug