* keyboard-configuration/optionscode: grp:alt_shift_toggle,grp_led:scrollCould you try to change in /etc/default/keyboard: XKBOPTIONS="grp:alt_shift_toggle,grp_led:scroll" into XKBOPTIONS="grp:lalt_lshift_toggle,grp_led:scroll" (two additional 'l' to enable only alt-shift and not altgr-shift)
Thanks! I've changed this and will see how it works after reboot.I do think it would make sense to allow both Shift keys, but only left Alt though. If anything, for accessibility reasons at least.
I also wonder if the combination of grp:alt_shift_toggle and level3/4 shift on AltGr works differently in X/Wayland.
Cheers!