IgnoreFileTimestamps value isn't followed

[mamema]

i've entered

IgnoreFileTimestamps=false

in arsoinic.properties

which, thats my expectation, the files should get sorted under "new music" according the last modified timestamp, which is the (unwritten) standard also in other applications like navidrome or lyrion mediaserver. (there it's working)
But the files appear to be sorted according the "last accessed" date, which is wrong, as this value changes every day when a backup is running, so the "new music" sort is kinda "unsorted".....
It's even so, that which the kagemomiji release the IgnoreFileTimestamps value is gone completely. It is not clear to me how i get back a full scan run which sorts according the "last modified" timestamp.

Do i have to configure something different here?