Thanks for the info! Thing is my AppImage contains libzstd that lacks the ZSTD_compressStream2, which your system’s libelf requires. You might try running the appimage with --appimage-extract cmdline argument, then running
rm squashfs-root/usr/lib/libzstd*
to drop that faulty libzstd and then just running
squashfs-root/AppRun
Sorry for the trouble!