Gamemode change with dungeon

For spectator mode, I got connection reset in nightmare dungeon which tp me back to spawn in spectator mode. I wander around spawn try to solve the issue, the good thing is i can interact with dungeon master npc and I decide to play easy dungeon. Won, but still in spectator so... i just keep flying around but randomly set back to normal(which i think is survival because i can break stone for my quest). For adventure mode, I ran more nightmare. Died for like 4 time before win 1 time. Thou i went back to my /home i notice that i can't break nor place block. Tried to do easy dungeon again if it will solve the issue like spectator but seems not, so I went and did a ticket. Thanks Joe for set my gamemode back to survival. Other people who experience adventure mode(dungeon related) is Hachiwaraa(they already become surv again). I think as Joe think www This might be a problem with dungeon failed to turn gamemode back after died or won? We will see if more people experience same issue...