Can someone PLEASE tell me how condition tags are logically applied in RH 2020

I've been banging my head against a wall for days. Either I TOTALLY misunderstand how they work, or RH is buggy as heck (I can already say it is buggy in the application of tags ... drag and drop onto text is useless, and I end up doing half the work in the source view).

RoboHelp 2020 - Latest build (2020.7.46)

Given the following diagram, I have:
Two "Program Name" tags

• Program 1
• Program 2

Five internal "Audience" tags

• BSS
• Carrier Services
• Contact Center Ops
• Customer Service (CS)
• IT Sys Admins

One external "Audience" tag.

• Contact Center Vendor

Given that:

1. At the topic level, all necessary tags are applied (all audience tags and one program tag).
2. At the content level, given all tagged groups have access to the topic, I would expect all non-tagged text to be available to all "Audience" tags.
3. At the content level, I would expect all specific "Audience" tags to be applied appropriately - so red tag "BSS_Admins" for example would see all un-tagged text PLUS the red-tagged text only.

Needless to say - my output does not work as expected. Here, for example is output given scenario 3 above, with the Program (Z) and Internal Audience filter (BSS) selected. Text that has been specifically tagged for other audience groups is still displayed.

Can someone PLEASE tell me what I'm doing wrong, or what I don't understand? Thanks!