Media connection lost in Nattress Generator bucket when Media Managed between systems

I had a test timeline (with one shot repeated many times) with various filters on.

One of the clips was actually a generator (Nattress frame to field) with a source clip bucket (with the same clip as the rest of the timeline dropped in it).

I media managed the timeline to a usb stick and brought it home.

Upon moving to my home system the clip relinked (sorry, reconnected) in the 'normal' timeline clips, but the clip in the generator bucket did not.

Is there a way of reconnecting to media in this way, or getting at least timecode/reel information from it?

I would think that this could make recapturing, recreating an archived sequence a problem otherwise.

Many thanks

Trevor