Found texture mapping error

I worked on my textures an found a bug or known error, i connected a normal block to an half round one. The left image shows the texture applied in the correct way, on the the right image you can see how the texture is cut.
After some research for my own i found out, that the round side of an half round block doesn't get applied one texture side, it one and a half.

My second image shows the 1 and a half fact better:

Wouldn't it make more sense to stretch the texture on halfround to 1 texturetile or to apply 2 texturetiles where the seam fits the mid?
The total round block fits well in every aspect but this one is one grid cell not on 2.

Thank you for fast support! A work around would be to organize my texture in an 8x8 grid instead an 4x4 but that would kill the texture feel and make the work x² ;D.