Please export the field groups which is not working after updating the Meta Box AIO plugin and share them here. If you do not want to publicity, please share via the contact form https://metabox.io/contact/, I will help you to check it.
I got it. After the AIO update a new rule appears into the metabox builder Custom fields settings.
Into "Advanced location rules" there is a new line "post" which should be used to select specific posts. Into the selected area there was the post types slugs pasted from the location field (client, prospect). That's very strange because no post have the same name as these cpt, so if I delete "clent" from the post rule then try to manually had it again it is not possible, because there is no such post...
I deleted the rule and everything works great. I will try on the production website this night.