MorphToMany pivots do not have the morph type column when detached

[gerardnll]

If you have a MorphPivot entity with a custom class, when attaching a record, you get the pivot with all the fields loaded on the model, but if you detach it, you only get the IDs of both sides, so in case of morphPivots, you do not get the type/class of the entity so there's information missing and you cannot obtain the morph relation from the pivot because it throws an error.

This can be fixed by referring to the pivotParent attribute on the MorphPivot but it's kind of weird as in the attach process you can refer to the relation. My solution is using the pivotParent attribute on both attach and detach events so we behave the same way in both situations.

[Sophist-UK]

In principal at last, this actually sounds like a genuine bug - is it worth creating a Github issue for it?

[gazben]

I've run into this issue and I too think this is a bug. I think it worth an issue.
The pivotParent attribute does not always results in the desired object.

[gazben]

I've suggested a possible solution here: #48432