Sequence inside a sequence not working

I was trained that taking a sequence, like an open or close that you create once, and insert it into your main comp sequence is called embedding a sequence.

And doing this created a single video and single audio file in the main comp and if you double clicked it would open the embedded sequence with all the video and audio files.

this latest update 21.1.0 does not work like it used to.  i bring in a sequence into the other and the video and audio files fill the main comp sequence. If I wanted that I just build all those layers in my main comp every time, it looks messy and unprofessional.

was there a preference change? do i have to say keep my embedded sequences slim, tiny, small, or what?

I go to a previous project and i can replace the sequence with another, but i cannot bring in a new sequence into the main comp without it taking up all the video and audio tracks.