I got major isssues on minecraft bedrock prevew. my stronghold which contains the portal for the dragon is missing. Actualy there is a little from it, a straight way to a library room and thats all. after sometime I change gamemode to spectator and saw it. It spawned right next to a big mineshaft so I guessing there is a missing rule about spawning  those two structures one over another and my mineshaft takeover my stronghold. You can check the map named Review at my review plus realm on possition 1.