It's just a visual bug, yet it's very infuriating and confusing. For example, a skeleton shoots and you block the arrow while still holding the 'use' button. Now the shield seems like it's not blocking though you still move slower and it still blocks damage.

What I expected to happen: the shield still showing the blocking animation after blocking damage.

What actually happened: the shield appears as if it wasn't blocking, yet still blocks and makes you move slower.

Steps to reproduce:

1- Hold 'use' button until you block damage

2- Still hold the 'use' button even after blocking damage (sometimes takes multiple hits).

3- (optional) Hold it until something tries to harm you again. You'll see how it still blocks.