Audio export with ENABLED effects yields "song is empty" - while export with DISABLED effects works.

[Linux / Lubuntu-19.04 / Ubuntu-19.04 / MuseScore3 3.2.3]

Attached is a minimal example.

MP3 or other audio format export with enabled effects yields "song is empty" while same export with disabled effects works as expected. In the case of MP3, every empty export always is 834 Bytes small, no matter how big the score is - see this hex dump:

0000000 fbff 4490 0000 0000 0000 0000 0000 0000
0000010 0000 0000 0000 0000 0000 0000 0000 0000
*
00001a0 ff00 90fb 0064 f00f 0000 0069 0000 0008
00001b0 0d00 0020 0100 0000 a401 0000 2000 0000
00001c0 8034 0000 4c04 4d41 3345 312e 3030 0000
00001d0 0000 0000 0000 0000 0000 0000 0000 0000
*
0000342

Terminal messages for this case:

Attempting to load LAME from system search paths
Loading LAME from libmp3lame.so.0
LAME library successfully loaded
MasterSynthesizer::setState: unknown <>
song is empty
QMutex: destroying locked mutex


May it have to do with Zita? Do I need to install something else? Live sound within MuseScore is always fine.

Any help appreciated.