Tileset collision not working until I select APaperTileMapActor

Like in topic. I created c++ class of APaperTileMapActor, set its tileset and layers. But my character ignore collision. Moment when I select MapActor in WorldOutliner all collision becomes enabled and everything is working how it should. Collision don’t work either when in launch. I’m copying my code from blueprint to c++ and in blueprint version there is no problem with that.