According to the Minecraft wiki page on Axes, axes are supposed to disable shields 25% of the time, "plus 5 percentage points per level of Efficiency on the axe, plus 75 percentage points if attacking while sprinting." But in a vanilla 1.16.3 server, axes break shields 100% of the time, regardless of those factors.
To reproduce this, have one player block a shield. The other player may stand still and click once with an axe, and the shield will be disabled 100% of the time.
Linked issues
duplicates 1
Comments 3
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-197537, which is a report that has not been resolved yet.
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Can you provide a short video of this happening along with a screenshot with your debug screen enabled (F3). If the video is to big please upload it onto YouTube as unlisted then post the link here. Also the wiki isn't a valid source of information