I upgraded my packages from 5.4.0-alpha.120 to 5.6.0-alpha.2 and walked into a problem with the schema-record package. I got the error Expected a resource schema and didn't know where it came from. So I digged into the code and found the change at https://github.com/emberjs/data/blob/245ba3cde61cb0690ba7f13739c3b03e5af2e193/packages/schema-record/src/-private/hooks.ts#L17C11-L17C37. As it seems there is now a test to check if the identifier is really a schema.

Looking at

where the check is defined, I saw that it looks for a key called kind in the identity object. So I added that data and everything worked again.

However, looking into the getting started guide

I see that there is not a kind key but a type. Shouldn't be that kind as well? Otherwise you will get the same error as I had.