No foot socket for the foot module when using modular control rig for UE4 skeleton characters in Unreal 5.5.4

I’m trying to rig old characters with UE4 skeleton structure using modular control rig. However when I drag the leg module to the thigh socket, it appears that the foot socket on the leg module is missing. I’ve tried everything to troubleshoot the issue but sadly no luck. I’m not sure if it’s a bug or it requires certain setup for the ue4 skeletal mesh to use the modular control rig. The foot socket is fine with UE5 skeleton though.

Before adding the leg module:

After adding the leg module, no foot socket near the foot tip for the foot module:

For UE5 skeletal mesh, it is correct:

Does anybody have met this issue and have a solution? Thanks!

After further testing, the foot socket and foot module works fine for characters with UE4 skeletons in UE5.4.4. It is weird, somehow it is broken in UE 5.5.

I found out the hard way, I can’t seem to roll back to 5.5.3 when it was working.

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Yes, it seems like a new bug appears just in 5.5.4.

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