I haven’t tried to replicate the issue yet, but have you re-saved your permalinks after adding the CPT?
That might solve the “invalid post type” error. Please let me know if it helps, otherwise I’ll investigate deeper.
Do you have any custom code or other plugins installed that might influence the permalink behavior?
Can you provide us with login credentials (please send them + a link to this thread to help@bricksbuilder.io using the email address from purchasing Bricks)?
I have spun up a couple of new sites and not getting this error. There is 1 site that is still causing problems but i suspect it is something with a plugin. Getting lots of errors on this site tbh so it could be anything.
Happy for this to be marked as no bug though as a new clean install is working as intended.