I'm using MC 1.16.4, the latest version of Forge and Carry On.
I activated a waystone, decided to see if I can pick it up, and I picked it up, but it also broke so I had it in my inventory, and in my hands, but I couldn't place it, so I killed myself, retrieved my items from the Corail Tombstone mod's tombstone, then this happened.
This time I was able to place it, when I tried again, it became a weird half block when placed. (https://cdn.discordapp.com/attachments/789397758670667799/820762423090348052/2021-03-14_21.51.44.png)
(https://cdn.discordapp.com/attachments/789397758670667799/820762425920847942/2021-03-14_21.54.34.png)

Also, I can't seem to find a config where I can blacklist blocks from being picked up. I'm sure there was one in the older versions.

The blacklist and whitelist configs are in the world's config folder. If you want to clear a carried item, do /carryon clear.

So there isn't a config that applies to all worlds?

if you put it in the defaultconfigs folder it will apply to newly created worlds.

All right, thanks.