Troubleshooting importing instrument track

I have 2 questions
When I import an instrument track from another project and it’s freezed when i unfreeze it delete the file in the original folder. It’s normal?
When I import an instrument track from another project and it don’t find the freeze file the track is always blocked and i must freeze and unfreeze for deblock the track. It’s normal?

yes it is normal, as stated in the Cubase manual:

NOTE
To edit the tracks, parameters, or synth channels again, and to delete the rendered file, unfreeze
the instrument by clicking Freeze again.

as for the 2nd part of the question, I have never tried to import a track which was frozen and I am not sure what you mean by “the track is blocked”

i don’t make anything before i freeze and unfreeze

For the first question i think don’t work so well because I import the track. I unfreeze and all work.
The problem is in the old project because when i open the old project cubase tell me the track don’t find the freeze file