When trying to edit a file in Topaz AI DeNoise yesterday, Lightroom had no problem "Preparing File for Editing" and then opened it up in the other app. Today, with a new folder of photos I tried it and it got hung up on "Preparing File for Editing", never opening in the other app. I tried going back to yesterday's folder of photos, and those photos still open in the other app with no problem.
Lightroom Classic version 11.1
Windows 10 - Home Edition version 10.0.19044