"Honey house" observation
you have been informed by knowlegable person about the propane behavior . Absolutely correct.
What you encountered is a possible restriction of the propane gas to enter the orifice at the input end of the valve . ( The stem which opens the tire valve of the bottle or the apdapter , when used ).
This is not one expects from a commercial product . However this is why you encountered a refernce to the "Modification".
Go fix !
Happy beeing, JDF