Did you untrim all at one go? I couldn’t. Tried many times.
The groove is totally fine, I can use _PushPull that allows multiselection to fill the gap (thank you a lot Mcneel team for multiselect faces)
a very strange thing is happened here:
if I write down the command as you did, it works and there is a screentshot of options it gives. “select a hole edge to delete”
Seems like setting that option either way in a macro prevents the window selection from working on everything… Not sure why, on first glance I would have thought setting it to _No should still have worked.