The population writes a party id into the issuer

The bond issue's issuer column is text: a name. The generated population writes a party uuid into it instead:

issuer: 001da331-48a7-466c-8548-a84bd7567367

So the trade page's Issue section cannot show an issuer. It shows a dash, and it deliberately does not show the id, because a uuid is not something a person reads.

The generator knows the party, since it picks it, so the fix is to write the party's name there, or to model the issuer as a party reference and read the name where it is shown. Which of the two depends on whether an issuer is always one of our parties, and that is a modelling question rather than a seeding one.