How do I unlock an imported frozen track?

When I import a frozen track from another project “File” > “Import” >“Tracks from Project” I sometimes get this message (warning):

“The cache file for frozen instrument “Kontakt 5 - Realitone - Fingerpick” could not be found. The instrument will be unfrozen.”

But the track is still “locked” when it is imported and I can’t unlock it. I have to freeze it again and then unfreeze it, to unlock it.

Is there a smarter way to do this?