Hi @funinjerusalem,
I believe this does indeed relate to a known bug – however it is on our tracker and is a high priority, so we hope to resolve it as quickly as we can.
We generally don’t provide support for third party plugins (and we’re not familiar with Convert Post Types code) which makes providing a specific fix a little tricky here, but certainly if you have other organizer posts to convert you might try adding a snippet like this to your theme’s functions.php file and see if that helps to avoid this issue, though, I can’t offer any guarantees I’m afraid.
Apologies for the inconvenience.