Broken favicon due to interaction with Agenda pluging

[andremann]

The Agenda plugin (https://github.com/haydenull/logseq-plugin-agenda) offers a Pomodoro timer that renders a badge at the end of the tracking.

Since the block looks like this [🍅 1min](#agenda-pomo://?t=p-1666074628585-4), your plugin tries to render a favicon for the URI and fails fetching it.

[andremann]

Maybe the problem is in the faviconObserver assuming it is right to fetch a favicon for every URL in (...), which is not in the case above.