Object Store Referece: Failed to update the instance ....not allowed to change the plan of reference

Hello! We are using object store reference instance in our mta like described here: https://community.sap.com/t5/technology-blogs-by-sap/object-store-on-sap-btp-setting-up-instance-sharing-on-object-store/ba-p/13615448In our mta we have something lik...