LFMN (Nice) Missing in MSFS 2020 FlyByWire A320 LEAP AIRAC 2107

Hi Sven,
no, can´t confirm it …

LEPA SIDs for 24R (AIRAC 2107 rev. 2 - sim version 1.18.14.0):

and here a screenshot of the FMC from LFMN - all approaches, all STARs available and selectable:

Possible your scenery/content file is messed. Have you tried this from the FAQ:

Cheers,
Richard