Make Bones Posable pre-convert to MHX makes toes not function

Previously, I had never used the Make All Bones Posable feature.

Imported a genesis 8 figure into Blender, with a geograft via Easy import - Rigs all merged already
Imported the standard Face Units, expressions Vismes and FACS
Made all bones posable prior to merging geografts.

Gave me the following error

Python: Traceback (most recent call last):
File "C:\Users....\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\Diffeomorphic-import_daz-21653af8d271\error.py", line 208, in execute
self.run(context)
File "C:\Users....\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\Diffeomorphic-import_daz-21653af8d271\figure.py", line 466, in run
self.addExtraBones(rig)
File "C:\Users....\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\Diffeomorphic-import_daz-21653af8d271\figure.py", line 719, in addExtraBones
self.updateScriptedDrivers(rig.data)
File "C:\Users....\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\Diffeomorphic-import_daz-21653af8d271\figure.py", line 581, in updateScriptedDrivers
vtargets,btargets = self.getVarBoneTargets(fcu)
File "C:\Users....\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\Diffeomorphic-import_daz-21653af8d271\driver.py", line 162, in getVarBoneTargets
vtargets.sort()
TypeError: '<' not supported between instances of 'DriverVariable' and 'DriverVariable'

location: <unknown location>:-1

Result: Toes are incorrectly rigged and become distorted on movement/disable stretching

‌

EDIT: Tried several times to replicate it and I can confidently say that using Make All Bones Posable then subsequently disabling stretching in the MHX panel results in the distortion

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