Bugs (that I've found):

-A bug that would accure where if you used 5 fireworks at once it would crash the game.

-A bug that would accure where if you left the game you skin would be stuck as your custom persona skin. And would not let you change back into a classic skin.

-A bug where on a rare occurrence will put the player's cape on the front of the player.

-A bug on rare occurance where there will be a chicken model fold out in the game on a mob.

-A bug where mobs will overly abundently spawn.

-A bug where mobs will spawn in light levels greater than 8.

-A bug when you enter a world the player's cape will disappear.

-A bug where player's custom skins will get switched with another player's custom skin upon entering a world.

-A bug where on rare occurance a Drowned mob will spawn with an Illager banner on its back. 

Halloween Mash-Up Pack(bedrock) bug issues:

-With the global rescources and rescource packs properly applied the skybox and clouds are there normal vanilla textures. Instead of the textures being there original counterpart (fully orange skybox and the clouds are purple) 

-A texture with the pig where all transparent parts are grey.

Note: I'm on xbox therefore i cannot upload screenshots at this time.