Using ios 18.3.1 (but reddit indicates that it has been happening since 18.1) I get a “frame load interrupted” alert / error when I try to convert a collaborative file in shortcuts to a PDF using built in actions. It works fine for files that only I have access to, but not collab files.
In the past, frame load interrupted issues such as the one with location details I believe were fixed by Apple in an update. If you have a reproducible error that gives a “deeper” error message like this that Shortcuts does not enable you to analyse further, the best thing is to file feedback with Apple detailing it.