What the title says. The attached video (creditsbug.mp4) provides a complete demonstration of the issue.
Entering the F3+F5 menu while viewing the credits also triggers MC-297901.
Note
I hope Mojang would consider allowing players' seenCredits data to be modified using /data, or implementing an equivalent solution, so that credits-related bugs can be reproduced in existing worlds without having to edit the data files.
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Ahh I forgot regular users can’t see files uploaded along with the report itself (by a mod or helper). This has been an issue since the Mojira migration. I have reuploaded it here so you can see it.
[media]Any actions the player takes while in this glitched state will be considered valid as long as they are within your block interaction range, although the player will not see them until they return to the end, and they cannot resummon the dragon by placing end crystals while in this state.
Only F3+F5 was fixed in 25w34a. For the continuation of the issue with F3+F4, see MC-301250.
Can Confirm, I add video file because you did not add anything.
[media]