Expected behavior:

The shield loses durability.

Reality:

Shield does not lose durability.

1) find a spider or a cave spider

2) make sure the spider/cave spider attacks you. if does not, hit the spider/cave spider.

3) hold a shield to block off the attack

Duplicate of MC-137588, and WAI, see @unknown's comment, here.

Thank you for your report!
We're tracking this issue in MC-137588, so this ticket is being resolved and linked as a duplicate.

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