Tree Control not working for out of box N:N KB to Category relationship in UCI

[DerekHAu]

Hi,
I have recently downloaded and installed these controls and am trying to use the tree control on the out of box relationship between knowledgearticle and category. I believe I have configured everything correctly (shown below) however I simply get a message box with [Object Object] and the control doesn't render. I have done a little further digging and it seems like it is getting a 404 for the many to many entity query because, whilst it is passed into the Xrm.WebApi call as all lower case, it somehow is changed to title case before executing the request, resulting in 404. To me, this seems to be a UCI bug with Xrm.WebApi as doing the same call outside of the PCF has the same outcome. Being on Knowledge Article, the classic interface does not support PCF so I can't validate if this worked otherwise.

Instance is 2020 with wave 2 enabled - v1710 (9.1.0.26143 online)

Has anyone else experienced this/logged with Microsoft?

Settings are:
Table Grid: All Categories
Tree Entity Name: category
Tree Entity Lookup Attribute: parentcategoryid
Tree Entity Name Attribute: title
Relationship Name: knowledgearticle_category
Relationship Entity: knowledgearticlescategories