Save everything in stats editor and close it (doesn't need to close, but needs to be restarted for it to update itself)

Work around is to use something like Notepad++ to open the Object.stats found in your mod files. in that find:

<field name="RootTemplate" type="RootTemplateStatObjectFieldDefinition" value="4bff4311-2e40-48f4-a06e-d6abd65adce2" />

the value part needs to be changed to the GUID (found in sidebar) of the object root template your looking at.
Picture:

https://imgur.com/a/3DJRR

Then you save Object.stats and re-open stats editor.