SUMMARY Album interpret. When specifying the name of an interpret resp. composer in the form: e.g. "Copland, Aaron" (surname, name) elisa interprets it as "Copland und Aaron" which is not correct. it would be good to not interpret the comma at all but to leave it as is.
Some modifications in the KF5 Frameworks may have solved your problem. Are you able to test with the flatpak build from KDE? See https://community.kde.org/Guidelines_and_HOWTOs/Flatpak In general we aim to do exactly what you ask for. We want to display (and in the future edit) the metadata as is.
This is already fixed when using KDE Frameworks 5.60 or higher. Please update the Baloo index once you have the update