No, it's a limitation of the Android Media Scanner. Sync bypasses this.

Is it a bug ? Because I don't really get the point why I have to sync, since the lyrics are in the tags ?
Why could'nt MMA just display the lyrics when they are just right here ?

Not via Sync from MediaMonkey for Windows? In that case it's likely that Android Media Scanner didn't pick up the Lyrics, you'd need to Sync from MMW to MMA for this to work.

From my PC to my phone, connected to my PC.

How did you transfer the file?

Hello,
I just transfered a FLAC file with lyrics in tags.
But they are not displayed in MMA.
I don't want MMA to lookup for missing lyrics, since they are in tags, just want them to be displayed.

Thanks for help.