Sheep are rendered like white sheared sheep through tinted glass blocks

The bug

If you put a sheep into a box of tinted glass blocks, it's rendered like if it were a white sheared sheep (even for other color sheep). That happens only for pixels that are behind these blocks. The other pixels are rendered normally. It seems to happen from a certain distance (between 15 and 20 meters). I've experienced that bug for some other entities and blocks, and it seems the bug only applies with sheep.