When breaking a block in Survival, then switching to any other game mode (where there should be no block-breaking animation) before you finish breaking the block, you can still play the block-breaking animation. The animation's state will persist when the block is broken and will loop upon repeating. This only works if you use the same item you were breaking with.
Video demonstrating: (file size too big)
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B4dAtMC
MrMuskle
This ticket may duplicate MC-19676.
[Mod] ManosSef
Thank you for your report!
We're tracking this issue in MC-19676 and MC-46766, so this ticket is being resolved and linked as a duplicate.
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can confirm in 1.21.4 and 25w04a