Pandas (other than aggressive pandas) will not stop biting on the shield unless if the player accepts to get hit by the attacked panda

If you hit a non-aggressive panda (accidentally or on purpose) and block the panda's bite with a shield, they will keep biting the shield until the player uncrouches and takes the bite.

Reproduce
1. Get a shield and a panda spawn egg
2. Go to survival

observed results
Non-aggressive pandas will keep biting the shield

expected results
Non-aggresive pandas should only bite the shield once as expected.