Thread continued from discord at the suggestion of IchoTolot:
In neolemmix, the 'owa_down' object from 'orig_fire' contains an animation error:
gif animation
(https://www.dropbox.com/scl/fi/j9rb6041f33wbf2uixgli/owa_fire_error.gif?rlkey=33jl2gfcdjiey8m3kpdx9uy3r&st=izceotns&dl=1)
The current animation is on the left, the fixed version is on the right.
This inconsistency is not present on the left/right one-way-arrows.
Only the graphics contains an error, the .nxmo file seems to already work as intended.
Attached is a graphical fix which updates the down-facing arrows to be more like the left/right arrows, as seen in the above gif.