Can't restrict placement of single blocks

[garfonzo]

No matter what I try, I can't seem to restrict the placement of specific blocks. For example, I've been trying to restrict the placement of dirt (just for testing) and it doesn't work. This is my permissions setup (pex):

- -modifyworld.blocks.place.3
- -modifyworld.blocks.interact.3
- -modifyworld.bucket.empty.lava
- modifyworld.digestion
- modifyworld.*

I've tried putting interact first, putting interact.*, and all sorts of combinations. If I do this:

- -modifyworld.blocks.place.*
- -modifyworld.blocks.interact.*

it will prevent placement of all blocks, but that's not my goal.

How do I prevent placement of specific blocks?

[PikachuEXE]

try pex user Playername toggle debug to find out the node first, could be related to setting