TB12 Buggy Commands for Collapse & Expand

See attached forum discussion links, Help Desk ticket and video, which includes time stamped explanatory notes below.

Status

11.06.20: David Gretzschel reported confusing behavior with these controls in the attached forum discussion.
11.06.20: My testing revealed mixed (buggy) results. > Attached documentation video shared in forum >
11.06.20: This demo link shared in new Help Desk ticket
11.08.20: Additional troubleshooting with David revealed more about how the collapse/expand commands work. For more tips and bug details, see the forum discussion above, along with the related links below.
11.08.20: Help Desk Ticket updated > Support replicated the bugs > Bug reports sent to Engineering
11.09.20: Update shared in Help Desk ticket re: the discrepancy in the naming convention for one of the related Markdown features recently discussed in the forum.
11.10.20: I shared Chase's feedback on this issue in the forum
11.11.20: Harlan said Chase was wrong
11.11.20: I asked Harlan for clarification since Chase's feedback seemed clear and accurate to me
11.12.20: I submitted a follow-up question to Harlan about my recommended label change for the block quote icons in the note editor menu
11.13.20: Harlan confirmed there was "something strange going on there". . . . :
11.16.20: Help Desk ticket closed without resolution . . . .
12.24.20: Update from Matt on Tab/Shift (indent) changes in 12.0.24 <== MZ: Review/Test

Attachments