Some links to external apps do not work in Firefox

I’m using Firefox 143 on Android 13 and have set the *Open links in apps* setting to *Ask before opening* (not sure about the exact phrasing in English, my device is set to Dutch) For some apps, this works, e.g., when I click on a link to a YouTube video, I'm asked to open the YouTube app. Same for a news app, the IMDb app, and some others. However, for some other links, this does not work: mailto links do not seem to do anything, although I do see a progress bar in Firefox for a split second. Also, links to my banking app and another news app do not work. In Chrome, all links work properly. I have already uninstalled and re-installed Firefox, but that did not fix the problem. Is there something I'm missing? Is there some setting that prevents opening external apps on a per-app basis?