Interesting. I'm not using a BM17 currently, I did try a modded version that actually promised to fix the snorkel, but it did not.
I think the BM17 is an incorporated modded truck ~ this vehicle does appear in almost every complaint including shuddering and steering violence to map incompatibility and the snorkel.
For all these reasons I am out ~ erm, wrong forum, I don't use it .
I confirm, the bug is related to front bumper type.
Without any bumper and with Reinforced Bar snorkel is working.
With Handlebars and Impregnable snorkel does not work.
I really don't know how they could program it this much wired way.
All the same at PTS 7.5
Snorkel does not work