Create a track with lots of volume automation.
On the automation panel settings set “Freeze Trim” to “Manually”
On the automation panel set “Fill” to “To End” with automation set to “Autolatch”
Hit play and trim the automation then hit stop.
What I see at this point is that the trim automation line incorrectly shows the level returning to the previous untrimmed level at the point where I hit stop. If I then hit “Zoom In” or “Zoom Out” it the shows me that the trim has in fact written to end as expected.
Here is a short and shaky video showing what I mean https://www.dropbox.com/s/dte1of03esuy2a8/2018-12-17%2013.21.36.mp4?dl=0