Posting this as a reference, a couple of issues from 8.0 that seem to come from Blizzard :

• Couldn't find inherited node: QuestChoiceLeftHide, QuestChoiceRightHide, QuestChoiceBottomHide on load. Probably a missing dependency somewhere in their files, as nothing in TRP3 or Extended inherits from those.

• Interface\FrameXML\OptionsPanelTemplates.lua:151: attempt to call method 'SetValue' (a nil value) when clicking on a checkbox without an OnClick script attached. Seems like a nil check missing on their end. Inherited template was changed to solve this issue.