Same issue - extremely frustrating. Already had issues with sub-zaps a month ago...
Hi there @DPS and @xavierB! 👋
I’m so sorry to hear that you’re both having some trouble with your existing Sub-Zaps no longer being available to select. If the Sub-Zaps are using an earlier version of the Sub-Zap app then that could well be why they aren’t available to select. If you upgrade all the Zaps to use the latest version of the Sub-Zap app and you’re still having issues then I’d recommend reaching out to Support team to have this investigated further.
To workaround this issue in the meantime you could try manually selecting the Sub-Zaps by entering their ID. To do that you’d select the Custom value option from the Select Your Sub-Zap field, then type in the ID of the Sub-Zap into the field. I’m thinking that should help to select any missing Sub-Zaps for now. You can locate the ID of the Sub-Zap from it’s URL when editing it:

Hope that helps. Please keep us updated on how you’re both getting on with this, keen to ensure this gets sorted! 🙂
Yeah, great… by not making it backwards compatible, you are forcing everyone to manually change all their sub-zaps.
I spent half a day updating the 100+ sub-zaps in our organization. Not cool.
I’m sorry about all the extra work involved in updating your Zaps, @xavierB. It’s definitely not a great experience, and I’ll be sure to share your comments with the team.
Really appreciate you sharing this to help us improve the experience going forward. Please let me know if there’s anything else I can help with in the meantime.