That’s a rapid fix, thanks so much @juliohm!
This fixed also the on() block blowing up. In addition, I can say that also both versions of combined geometries of France and Spain are plotting swiftly now.
Following your comment on the way I merged the two, what is the best way to join or merge two shapefile geometries? Using vcat on the two GeoTables?
I do have a remaining issue with the ObserverFunction in Makie, but since it is unrelated to Meshes, I will make a new thread for that.