So versions: v_slab_compat-1.20-2.1
minecraft 1.20.1
Neoforge 47.1.76
Description: Vertical slabs have no matching appropriate tool and when broken don't always drop anything

So in the picture an oak vertical slab The One Probe says an iron axe is not the right tool. The tool will indeed break it and drop the slab item.

But for stone based vertical slabs even when broken with a netherite pickaxe they will not drop anything.

The Only metal based vertical slab I can break that drops anything is the electrum sheetmetal slab

Can use a mining laser from Direwolf20's Mining Gadget mod. to mine all slabs...

Latest update v_slab_compat-1.20-2.2 has made it so wooden slabs also no longer drop when broken
Mining Laser can also no longer break and create the item version.

I can't replicate this. See if you have errors on your log

Placed 32 Vertical slabs Broke them with the mining laser
Checked logs
console
debug
latest
Nothing shows up on any of the three

Placed 32 Vertical slabs Broke them with the mining laser
Checked logs
console
https://gist.github.com/Staegrin/22b28e94523a4c4bdcac613e2f3fd86a
debug
https://gist.github.com/Staegrin/0fc306dfbb3123a34aeaeb7447d34609
latest
https://gist.github.com/Staegrin/3320e077cd1443170be78d1e3388734f
Nothing shows up on any of the three

Did a clean install. Breaking worked fine with just
v_slab_compat-1.20-2.2
moonlight-1.20-2.8.67-forge
mininggadgets-1.15.6
jei-1.20.1-forge-15.2.0.27
Going to have to go through all mods to find the mod causing conflicts with vertical slabs

Found the culprit
create-1.20.1-0.5.1.f
With create installed Vertical slabs no longer drop when broken

Illl need to do some testing

v_slab_compat-1.20-2.3 seems to have fixed this issue