I can intercept and view intents but on my Android 12 Sony Xperia 5 iii I get a toast message warning if I try to send the edited intent. In this case I am intercepting the open directory buttons from Syncthing fork.
I wonder if it's related to this discussion:
https://stackoverflow.com/questions/48117511/exposed-beyond-app-through-clipdata-item-geturi
See image from this app:

And from App Manager which behaves the same way but throws a different toast:
