When testing textures to find bugs like an example would be the kelp blocks top lines not connecting to the lines on the side (fixed) I noticed that glass, and iron bars do not fit symmetrically inside the chiseled stone brick blocks. I haven’t tested to see if any other blocks don’t fit symmetrically inside. Hopefully this is a bug, but if it’s not then that’s ok.
The 2x2 texture of the iron bar is properly centered in the 16x16 texture of the chiseled brick. However, the 16x16 texture is not symmetric so it appears off center.