Can't assign ['<Shift><Control>a'] in GUI

[daetanbhuck]

Describe the bug
I can't assign Shift + Control + a in the Tiling Assistant GUI as any shortcut. (The shortcut can be assigned, and works, when dconf is edited directly.)

Steps To Reproduce
Attempt to assign Shift + Control + a to a shortcut in the Tiling Assistant GUI. If Shift + Control + a was previously assigned using a dconf edit, clear the keybinding and attempt to assign in the GUI.

System Info:

• Distro (incl. version): Debian 13.2 Trixie (as well as 12.12 Bookworm)
• GNOME Shell version: 48.4
• Extension version and from where (e. g. EGO, main branch...): 53 from extensions.gnome.org
• XOrg/Wayland: Wayland

Journalctl logs
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