Hey there,
The FreePlane script was not working well. It produced links that looked like this:
%5BFlow%20Fellows%20Wellness%20Mini-Retreat%202023%2007%5D(file:///Users/user/Documents/mindmaps/Flow%20Fellows%20Wellness%20Mini-Retreat%202023%2007.mm)
I figured out how to fix it, and describe it in this Gist: Fix Hookmark Freeplane Get Address Script · GitHub
Probably also relevant to FreeMind users.