Minecraft Dungeon release was quite successful but that does not mean that the game was problem-free as fans did come across a few bugs when they started playing the game. Luckily, the developer is aware of most of it and have been working to fix many of those.
The new update 220.127.116.11 will only be available for the PS4 and Switch console for now while the PC and Xbox One version will come later on with a few more fixes for issues specifically for those platforms only.
Mojang has already released the full list of fixes that the patch will address including the crash issues, the issue where players were spawning, and sometimes dying under the world when the mission is compared. Local co-op issues when the third player joined will also be addressed.
You can check out the full list on their website to see if the ones you have been experiencing were also addressed.