One Shot Mods in QMK with multiple/simultaneous presses

[wheredoesyourmindgo]

I am wondering OSM works in QMK. For some reason, when I try to use this feature in a given layer (and this has been the case for the past few years), it is always unpredictable in terms of how it works, specifically when I try to press multiple OSM keys at once or in a sequence. It seems that sometimes, not all the time, it just releases the OSM mod when I press another OSM mod.
I've always used my own implemetation of this feature, source code link below, which has always worked the way I wanted the feature to work. However, I'm not sure why I shouldn't be able to reproduce this behavoir using the built in OSM functionality (in-lieu of maintaining my own implementation). Thanks in advance for any feedback.
github link to favorable implementation