LOG: kwin_xkbcommon: XKB: Couldn't process include statement for 'latam(\0)' kwin_xkbcommon: XKB: Abandoning symbols file "(unnamed)" kwin_xkbcommon: XKB: Failed to compile xkb_symbols kwin_xkbcommon: XKB: Failed to compile keymap CAUSE: In "~/.config/kxkbrc", "VariantList=\\0" automatically set as "\\0" on login. WORK-AROUND: Setting "VariantList=basic"
Can confirm.
In fact this is Bug 433576. *** This bug has been marked as a duplicate of bug 433576 ***