Crash Musescore 4 Nightly

Today I experienced a crash running the Nightly build from Oct, 10th.
Upon closing the app it crashed (after refusing to save changes to the open file) with the following message:

/tmp/.mount_MuseSc7ltvD2/AppRun: Zeile 26: 44217 Speicherzugriffsfehler "${APPDIR}/bin/mscore-portable-nightly" "$@"

Prior to the crash message there are a couple of other messages:

[44226:44226:20221010,223056.797105:ERROR elf_image_reader.cc:116] no preferred header address
[44226:44226:20221010,223056.797108:ERROR process_reader_linux.cc:520] no module mappings 0x7f7984619000
[44226:44226:20221010,223056.797518:ERROR elf_dynamic_array_reader.h:61] tag not found
[44226:44226:20221010,223056.797558:ERROR elf_dynamic_array_reader.h:61] tag not found

OS: Ubuntu 20.04
Appimage
=== Started MuseScore 4.0.0-Development, build number 3216906122 ===

Logfile attached.

Klaus