MP3 bitrate is not 'immediatly' saved when export

2.3.2 version / Windows 10

1) Load a score, any one, eg: Fantasie.mscz
2) Edit -> Preferences -> Export -> Audio: change the MP3 bitrate value, let's say to 80 -> Ok
3) File -> Export -> MP3 audio -> Save
Result: 128 kpbs (ie the default value), in Properties/Audio

New attempt, same process/steps with the same loaded file and 112 value. Result: 128
A last one, with 64. Result: 112, and so on.

• First reported here (French forum): https://musescore.org/fr/node/275329