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Considering the previous post concerning the untrapped,(or double-trapped) shower drain, perhaps the washing machine discharge riser/branch IS unvented, I see many add-ons where this happens although...

Considering the previous post concerning the untrapped,(or double-trapped) shower drain, perhaps the washing machine discharge riser/branch IS unvented, I see many add-ons where this happens although...

Just me, but that seems like more trouble than fixing the problem

It could also be a situation of the washing machine discharge branch being positioned in a way that causes it to suck the water out of the trap in the shower which then allows open passage for sewer...