So, we switched to that version because of permission issues. Unfortunelly now all non craftable slope types are unavailable. Right click action results only in slope rotation.
Tested with only Carpenter's Blocks in enviroment ( non dev )
Forge .1614.

Rotation was an intentional change added with rotation support for slopes. Subtypes should only be available when you use scroll wheel, before placing the slope.

EDIT: In case you didn't know, it should be sneak + scroll.

By subtypes I was referring to diffrent variantions that are formed upon placement like corner ones.
I was a little inacurate, sorry about that. Yes, all five slopes ( that are visible in creative menu ) are available via scrolling but not the other ones like it was in 3.3.7 that has been available by scrolling and hammer use.

You're correct that hammer clicks only affect rotation now. Non-selectable corners will only appear during placement. Are you having an issue getting a corner correct?

Nope, they forms correctly upon placement. Thanks for clarification. Now I know that inability to preselect them is intentional change, cheers :).