Hi, bit of a puzzle
Mac OSX 10.14.6 | PM5, PM6 | Lightroom Classic
In PM5 I have always right-clicked my images and selected Edit images with>Lightroom, which I set in Preferences>Launching.
I recently updated to both PM6 and Lightroom Classic.
In PM6 I tried to assign the default Launching application as Lightroom Classic, but a pop-up blocked me telling me I couldn't launch Lightroom in this way, and I should drag and drop to Lightroom.
Puzzled, I went back to PM5 and it allowed me to assign the default application as Lightroom Classic. Everything worked as it normally does for me.
I went back to PM6 and now my default application has changed to Lightroom Classic! Bizarre. It continues to work perfectly for me.
Why block it if it works well for some users?