Screen turns to black after 3 seconds on certain maps

[gombas]

When i launched dungeon and blood version 4 the game turned black with hud elements still visible, sfx could still be heard and you could move around but couldnt see. I haven't tested this on all custom maps but it didnt happen on the original maps.
To reproduce:
Go to solo, custom maps
launch blood version4 / dungeon
wait 2-3 seconds
black screen

expected behaviour:
no black screen, able to see the map

only tested on Nintendo switch

[gombas]

update: same bug happens on F4ll and Fegefuer.