In Umbraco 8.6, I have a DocType structure like this

Level1DocType -> Level2DocType-> Level3DocType

so Level1DocType inherits from Level2DocType, which in turn inherits from Level3DocType.

Each DocType adds one group of properties. In content items of type Level3DocType, I want the groups to show up in this order:

Intended Group Order:

• Level3DocTypeGroup
• Level2DocTypeGroup
• Level1DocTypeGroup

So in the DocType editor for Level2DocType, I have reordered the groups so Level2DocTypeGroup is first, followed by Level1DocTypeGroup inherited from Level1DocType:

Expected order of inherited groups:

• Level2DocTypeGroup
• Level1DocTypeGroup

but in the DocType editor for Level3DocType, the inherited groups show up in the order of inheritance and not in the order specified in Level2DocType:

Actual order of inherited groups:

• Level1DocTypeGroup
• Level2DocTypeGroup

so there is something not working right here.

For Level3DocType, I now have this group order:

• Level3DocTypeGroup
• Level1DocTypeGroup (inherited)
• Level2DocTypeGroup (inherited)

Now if I create a content item of type Level3DocType, the content item has the following order of property groups:

Actual group order of content item:

• Level1DocTypeGroup
• Level2DocTypeGroup
• Level3DocTypeGroup

Expected group order of content item:

• Level3DocTypeGroup
• Level2DocTypeGroup
• Level1DocTypeGroup

So it seems that when inheritance of DocTypes is in play, the group order as defined in the DocType is not honored.

Am I doing something wrong, or is this an issue which I should add in the issue tracker?

Thank you for any input on this!