The resource pack isn't specifically causing the issue, it's any item or block display with a block sized model, and since writing this post I have come to realise it's because of how Fabulous Graphics change the rendering of the breaking animation, making it apply directly to the block texture instead of above it.
FracturedFlux
The resource pack isn't specifically causing the issue, it's any item or block display with a block sized model, and since writing this post I have come to realise it's because of how Fabulous Graphics change the rendering of the breaking animation, making it apply directly to the block texture instead of above it.