FFAPI does not let setAttached with null to remove it

[Teal-Wolf-25-v2]

Minecraft version

1.21.1

Describe the bug

FAPI lets you setAttached with null to remove it, but neoforge does not

Steps to reproduce

1. Install Sinytra Connector and FFAPI
2. Install Would you be a doll? (Others likely exist but this is the mod I ran into the issue with)
3. Become a doll
4. Die
5. Attempt to respawn
   ...

Logs

https://mclo.gs/zxMshGt

Additional context

I am unsure exactly what the bug is based off the logs but some mates think it is a bug with FFAPI's implementation of the FAPI data attachment api specifically not being able to setAttached with null to clear it