This may have been fixed in the prerelease, but in 20w22a sleeping in beds caused explosions in the overworld in my custom world, how they normally should in the nether. If it helps respawn anchors will also explode in this world. Also the custom world settings are:

{
"bonus_chest": false,
"dimensions": {
"minecraft:overworld": {
"generator": {
"biome_source":

{ "seed": -1464245863, "large_biomes": false, "type": "minecraft:vanilla_layered" }

,
"seed": -1464245863,
"settings": "minecraft:overworld",
"type": "minecraft:noise"
},
"type":

{ "ultrawarm": false, "natural": true, "shrunk": false, "ambient_light": -0.5, "has_skylight": false, "has_ceiling": false }

},
"minecraft:the_nether": {
"generator": {
"biome_source":

{ "seed": -1464245863, "preset": "minecraft:nether", "type": "minecraft:multi_noise" }

,
"seed": -1464245863,
"settings": "minecraft:nether",
"type": "minecraft:noise"
},
"type": "minecraft:the_nether"
},
"minecraft:the_end": {
"generator": {
"biome_source":

{ "seed": -1464245863, "type": "minecraft:the_end" }

,
"seed": -1464245863,
"settings": "minecraft:end",
"type": "minecraft:noise"
},
"type": "minecraft:the_end"
}
},
"seed": 404,
"generate_features": true
}