@Caldathras - No problem, it's all good!

I did ended up upgrading manually Xfce from 4.18 to 4.20, but it wasn't so smooth at first and I had to do some fixes afterwards. It's ok now, but it isn't something I recommend doing it unless someone really wants to spend some time smoothing out the rough edges.

In my case I really wanted the 4.20 version because there's a very nice new feature that I didn't see mentioned anywhere (but only noticed it when testing distros that had Xfce 4.20) - the icons from the windows buttons list are finally at the right size. Previously, the icons size from windows buttons went from 16 px straight to 32 px (with nothing in between) - so, for instance, with the standard taskbar from the current Mint Xfce (with 4.18), the app launchers (24 px) are bigger than the icons in the windows buttons list (16 px). It seems something minor in theory, but for a daily usage it makes a huge difference having the icons bigger in the windows list.

Thankfully, we're only a few months from the next major Mint release with a new LTS base, so everyone will be able to enjoy the new Xfce version on Mint soon.