Sewage Ejector causing trap siphonage?

I went to a house today the client had a complaint that the powder room smells like sewer gas so badly she cant use it. I didnt think it was bad, but I looked for her. I checked the sink trap and toilet. I inspected the piping in the basement as well. I found that the ejector ties in about 2’ downstream from where the sink meets the main line. Is it possible, considering they use A LOT of toilet paper, that the ejector causes a pressure differential and siphons the sink trap even if all piping is properly vented?

I am imagining that wooosh being too much for a 1 1/2” vent off a lavatory sink.


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