i had this issue today even though xdman was removed weeks ago and octopi reported that firedragon-extension-xdm-browser-monitor was explicitly installed and so was xdman-beta-bin so i used octopi to change the install reason for both, then i removed firedragon-extension-xdm-browser-monitor and then i used Garuda Assistant to clear my orphans and caches after which the update proceeded normally.
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