If it helps, https://github.com/sindresorhus/Pasteboard-Viewer shows Safari returning public.url while Orion returns public.utf8-plain-text, both on mobile and desktop.
Specifically, continuing with the same google.com example as @eirk, Safari shares one item of type public.url:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
<string>https://www.google.com/</string>
<string></string>
<dict>
<key>title</key>
<string>Google</string>
</dict>
</array>
</plist>
While Orion shares 3 items.
Item 1: public.utf8-plain-text
[Google]
Item 2: public.url
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
<string>https://www.google.com/</string>
<string></string>
<dict/>
</array>
</plist>
Item 3: public.utf8-plain-text (blank/empty)
Here's a screen grab of both:
