Error KIO Client on logseq URLs on Linux - why Logseq doesn't register itself as the handler?

I installed the Awesome Props plugin.

When I click its menu link called “Custom icons config page” I get the following error:


This link is processed by a handler which does this:

   window.location.href = `logseq://graph/${}?page=${globals.pluginConfig.iconsPropsPage}`;

from here

It is my understanding that Logseq should have registered itself as the handler for this URL schema, however it didn’t happen on Linux Kubuntu 22.04.

How to resolve this issue?

I run Logseq as AppImage. I feel like this is the reason it’s not in the system.