LR 11.4 Synchronization overwrites Aperture

Just for sorting through images I like to use the automatic feature in tonal control (direct translation from German "Automatisch in Tonwertkontrolle").
I just want to keep the value of aperture and overwrite everything but aperture (synchronize and uncheck aperture). For some reason the value resets to 0 even though aperture is unchecked.

If I just synchronize some images it usually works. If I sync all images it either works for some (first third works, the rest gets reset) or none of the images.

The bug has been around for more than a year now and several versions.

I use Macbook Pros (different ones with up to date OS) and all show the same issue.