The arm animations for the player when clicking in the air and when breaking blocks is broken when applying the Conduit Power with this command: /effect give <username> minecraft:conduit power 100000 100 true. The air clicking animation for the arm just goes down without showing its clicking and the block breaking animation for the arm isn't even used. This applies for all perspectives.
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Please provide a small video with the debug screen enabled (hit the F3
key) demonstrating the issue.

Uploaded short video. Can confirm for 1.13.1.
Are you using any potion effects?

No. I'm just using vanilla creative mode. It also applies when in survival.
EDIT: I actually forgot that I was using the Conduit Power.

The player arm animation only gets broken when I use the Conduit Power with this command: /effect give <username> minecraft:conduit power 100000 100 true.
This would be a duplicate of MC-10755 then.