CTRL+SHIFT-Select of subparts in poly surfaces doesn't work when grouped

Hope this screenshot makes it clear, I want to write the calculated angles on the top surface by CTRL+SHIFT-select the top surface and align the construction plane.

But this doesn’t work if the poly surface is grouped with the bunch of lines and stuff. which makes sense in my modeling approach and I have plenty of grouped panels.

To demonstrate this strange behavior I will first try to select this way within a group and then ungroup the poly surface as it works like a charm then

VIDEO: https://recordit.co/oA6B8iO37j.

Any ideas whether this is a bug or it is intended to work this way? Thank you!