Picom + xrdp unfocused windows disappear

Hello everyone. I encounter a strange bug with xrdp session and picom. If picom runs, all windows except selected one disappear. I've tried "unredir-if-possible = false;", but it changes nothing. Any suggestions? Setup: xrdp, bspwm, picom (xrender), kitty, xfreerdp(viewer)
No related errors in logs