Spring 20 An error occurred while trying to update the record

We have resolved this issue. In aura component or lwc, when we have a if we don't specify a recordTypeId we receive the error specified:

An error occurred while trying to update the record. Please try again. Record Type ID: this ID value isn't valid for the user: 012000000000000AAA

So if no recordTypeId was specified in the component an exception is thrown (only in Spring '20, in our prod environment all works fine without the recordTypeId specified)

We forced each lightning component to have a recordTypeId dinamically based on our business logic and the issue is solved for us.

<lightning:recordEditForm aura:id="form"

recordTypeId is a variable where we return dinamically the recordTypeId we need.

After that fix we can create all records like in our production environment with the correct configuration.