No screenshot mode starts on Sway about flameshot HOT 5 OPEN

$ flameshot -v
Flameshot v12.1.0 (-)
Compiled with Qt 5.15.10

$ flameshot 
QObject::connect: No such signal QPlatformNativeInterface::systemTrayWindowChanged(QScreen*)

...
access("/home/user/.config/flameshot/flameshot.ini", F_OK) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/user/.config/flameshot/flameshot.ini", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, STATX_ALL, 0x7ffd29aad460) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/user/.config/flameshot/flameshot.ini", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, STATX_ALL, 0x7ffd29aad3f0) = -1 ENOENT (No such file or directory)
access("/home/user/.config/flameshot.ini", F_OK) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/user/.config/flameshot.ini", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, STATX_ALL, 0x7ffd29aad460) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/home/user/.config/flameshot.ini", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, STATX_ALL, 0x7ffd29aad3f0) = -1 ENOENT (No such file or directory)
access("/etc/xdg/flameshot/flameshot.ini", F_OK) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/etc/xdg/flameshot/flameshot.ini", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, STATX_ALL, 0x7ffd29aad460) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/etc/xdg/flameshot/flameshot.ini", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, STATX_ALL, 0x7ffd29aad3f0) = -1 ENOENT (No such file or directory)
access("/etc/xdg/flameshot.ini", F_OK)  = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/etc/xdg/flameshot.ini", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, STATX_ALL, 0x7ffd29aad460) = -1 ENOENT (No such file or directory)
statx(AT_FDCWD, "/etc/xdg/flameshot.ini", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT, STATX_ALL, 0x7ffd29aad3f0) = -1 ENOENT (No such file or directory)
brk(0x55c177515000)                     = 0x55c177515000
poll([{fd=5, events=POLLIN}, {fd=13, events=POLLIN}, {fd=14, events=POLLIN}, {fd=21, events=POLLIN}], 4, 86399446) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\1\0\0\0\0\0\0\0", 8)          = 8
poll([{fd=5, events=POLLIN}, {fd=13, events=POLLIN}, {fd=14, events=POLLIN}, {fd=21, events=POLLIN}], 4, 86389991) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\1\0\0\0\0\0\0\0", 8)          = 8
poll([{fd=5, events=POLLIN}, {fd=13, events=POLLIN}, {fd=14, events=POLLIN}, {fd=21, events=POLLIN}], 4, 86379988) = 1 ([{fd=5, revents=POLLIN}])
read(5, "\1\0\0\0\0\0\0\0", 8)          = 8

(gdb) bt
#0  0x00007ffff6320f6f in poll () at /usr/lib/libc.so.6
#1  0x00007ffff516c2b6 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff510c162 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007ffff6aead0c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ffff6a9ac04 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007ffff6a9c0a3 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00005555555bd870 in main(int, char**) (argc=<optimized out>, argv=0x7fffffffe0b8) at /home/user/src/flameshot/src/main.cpp:161