I've had a similar problem before, which is why I started working with nests instead of merged clips in some instances.
What do you mean by
once the name has been changed and the clip moved away (or even worse deleted from the project)
I hope you didn't mean the source material, that causes problems for everything.
If one of the source path windows show up blank via right-click > properties, then that means something is offline and should be relinked.
Sorry for not being clear. I was talking about renaming the merged clips. For instance, if I have a file named "audio01.wav" which I merged with "video01.mov" and rename it "action1", there is no reference in the renamed merged clips and the source clips.
Of course I could rename it "action1_audio01_video01" but makes the workflow a bit complicated.
What is great in Ppro though is that even with the source clips deleted the merged clip still remains in the project and stays connected to the source files. Which is it's even more bothering not being able to show information about source clips from a merged clips.