Can't export animation with using locator and nullobject

[DevLofell]

What are you trying to do, and what do you expect to happen?

I'm trying to import my modeling in unreal. i checked when i changed objects(not nullobject) values(transform, rotation, etc.) that can export animation(glTF format), but when i using nullobject with locator(i checked ik root and ik target) i can't export with glTF format.

What happens instead?

.

Model format in which the issue occurs

glTF

Blockbench variant

Program

Blockbench version

4.9.4

Operating System

Windows

Installed Blockbench plugins

No response

[DevLofell]

but if i not use null obj and locator then when i use just change only transform,rotation and scale animation. it works