unsupported data error with nested joins/preloads #6956
Description
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Description
In our project we have deeply nested data that needs to be joined and some additional values preloaded.
In a previous version of gorm (1.25.5) this was working.
Now we get a unsupported data error stemming from gorm/callbacks/preload.go#L140
The issue seems to be introduced in #6877.
The value of db.Statement.ReflectValue.Kind().String() is ptr.
My best guess is that preloads of sub-structs of optional nested structs/joins are the problem.
If I duplicate the whole case reflect.Struct: case (in gorm/callbacks/preload.go#L133) as an additional case reflect.Pointer: case, our code works again.