Hi,

I'm not 100% sure if it is a bug, but while using the /fill command there are filter aliases for nearly anything e.g.

#minecraft:impermeable for all (colored-)glass blocks or #minecraft:carpets for all the carpets.

And there is none for concrete.
I realised it while working with concrete, but it would be great if there would be some aliases for concrete powder and teracotta too (e.g. #concrete, #concrete_powder, #teracotta ?)

Best Regards.