Describe the feature

Currently (at least in 1.18) there's no way to bridge inverted double slope slabs with the regular slope slab unless I'm missing something, an upside down slope slab would fix this

Nvm this, I just pressed shift, did not know that was a feature

No worries. I really need to document stuff like this better as currently some of these things are only mentioned briefly in the block list on the CurseForge page. I haven't decided on a documentation solution yet though