Event Begin Play of Level Blueprint fires twice

Did someone found any solutions to this? After two months on working on a project all my actions from my level bp are fired twice. The problem occurred after I’ve updated to 4.21.2 but in the same day I’ve create streaming levels, so I don’t know exactly what is the problem.
I’ve created a copy to the project and delete everything and Begin Play still fired twice. I also have another level and there is working without any problems.
Thank you!