Great question — answering as the UphillTech team:
I found out why it didn't work. I reinstalled FreeBSD, and when I was reinstalling it, there was an option for a plug-in called "Moused" If you select that plug-in on installation, it works fine.
Full answer by Ry362: https://unix.stackexchange.com/a/612815 (CC BY-SA 4.0).
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