As I try to print five hexagonal towers, Acura seems to insert randomly a thin horizontal wall on some. They seem to be different on every slice, sometimes there are one sometimes two. This was on Cura 3.2.x but I was also able to reproduce on Cura 3.3.1, both times on a Mac.
the resulting print does include that thin wall, on two out of five towers. I thought it had to do with adaptive layers at first but it remained after disabling any beta feature.
five_coarse_pi3mk2_hive_module_v4.3mf