One of my players reported that the texture on E1M1 Block 9 appears massively pixelated on its X- and Z-axis sides when compared to the other E1M1 blocks.

It's not an explicit "error," as in it doesn't make things literally unusable -- It's just a point of possible polish that can be addressed by the team.

The textures would need redone as they were gifted by an old resource pack. Not currently worried about it at this time.