Metaball subobejcts aren't mirrored correctly - rotation isn't mirrored

when i’m in Edit mode and trying to mirror selected deformed Meta Elipsoid, i’m expecting to get soemthing like this:

but i get this instead:

only position is mirrored. hovewer, the mirroring works correctly if i duplicate and mirror the whole object containing metaballs.

the only other info i found was an ancient blender bug thread with no responses where exactly the same issue was mentioned.