These new ventless gas cans are a pain, so I worked around the problem. Don't throw away your old plastic gas can, retrofit it with a traditional spout and vent. There are companies that sell the parts to do it (example in link):

https://www.amazon.com/gp/product/B07R8XQHTV/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&th=1

I installed retrofitted every one of my gas cans and now they work like they should.