Nested TouchBar groups

Hey I saw an old issue on github for nested button groups on the TouchBar, and would really like this feature, currently it half works by creating the groups separately and dragging the group you want nested into another group, however some things are broken, such as the close currently open TouchBar group. I would expect that to close the current group and go back out to the first level group, instead it puts me back out to the main interface.

Ive seen this too. Instead of close I use open (Opening the parent group).