Thank you, that's really useful. I've released update 4.28 to fix this.
I suspect the root cause was that the Dizzy's employee you hired was created before the new update. I made quite a few changes to the generation of these staff to fix some other bugs, which means old non-hired Dizzy's staff might not play nice with the new version. If you run into any further problems, you could try deleting the Dizzy's staff and hiring new ones.