Ah, that behavior is likely due to relay.primal.net routinely purging non-standard, custom kind events from their relay. I know that the Ditto relay (wss://relay.ditto.pub) and Damus (wss://relay.damus.io) retain such events based on my own experience.

P.S. Make sure to instruct Shakespeare to remove wss://relay.nostr.band from your sites, it hasn't been responsive as of late and might also cause issues.