I have been going through new houses under construction in my area to learn about Drain, Waste, and Venting (DWV). I found this configuration (reference image below) and it does not look to be correct. A short section looks like a wet vent for the Clothes Washer.
Is this permissible in the Plumbing Code?
Will there be problems with this type of configuration?
Would the water in the Clothes Washer Trap be syphoned out when the Utility Sink is being used?
Should a Sanitary Tee, like this one, be used instead (reference image below)?
What other configuration would have been acceptable?