Searching for lookup in newly referenced package

I’ve created a new package. Then I have referenced another one, that contains a lookup. In the new package, I’ve created a new entity with a new field. In the new field I’ve tried to search for lookup (DefaultLookup field), but it wasn’t in drop down.

Workaround: To reopen the new package again. Then the lookup is offered in the drop down.

Not a bug, this is normal behavior

That is correct. Now on file system model persistence it might be easier to
do something about it?