Minecraft Version

1.20.x

Forge Version

47.4.0

Vampirism Version

1.10.13

Incompatible mod

https://www.curseforge.com/minecraft/mc-mods/enders-craftable-command-block 1.0.0

Singleplayer/Multiplayer

Both

What happened?

Cannot fly in bat mode with Ender's Craftable Command Block

Reproduce steps

Transform into a bat and try to fly

Relevant log output

Unfortunately, that mod is not open source, therefore I don't know what is going on.
However, I suspect they are messing with the canFly attribute.

Please report this issue with them and point them e.g. to my report on a similar issue with ArmorPlus:
sokratis12GR/ArmorPlus#281 (comment)
In NeoForge there is a fancy way to resolve this, for Forge it is more tricky.

If the issue is different and they can tell us why, please reopen this issue