/fillbiome command changes biome in patches

When you use /fillbiome the biome will only be set in patches that extend outside of the range you set and in-between the patches the original biome will still remain. Also the command will only set it on the y axis you included in the range (may be intentional). Also the command causes some visual glitches.

 

Idea:

Remove the Y axis from the command's range.

 

This is unfortunate as this command is so useful.