Why do edit points disappear when trimming?

I’m just learning about trim automation, and something is confusing me. I am editing the volume automation using trim. If the audio is stopped then I can use the arrow and create edit points on the trim automation line to adjust the automation. Those edit points remain there. However, when I am playing the track and adjusting the trim with the fader in realtime, I see the trim line adjusting and affecting the volume automation but as soon as I stop the audio that real-time trim automation is applied and there are no edit points on the line (the trim line just becomes straight).

Is there a way to trim edit in real time as the song is playing and then go back and edit the trim line? Thanks!

No one? Maybe my question doesn’t make sense? This is such strange behavior that it seems like a bug (but is surely user error)…