My worlds I've converted from the previous version of Minecraft on Nintendo Switch (Minecraft: Nintendo Switch Edition) cannot be loaded anymore. 
It will say: There was a problem loading this world 

If I convert the same world again on 1.6.0 it will work and I'm able to play the game again.
But this would mean losing all of my progression on the bedrock edition.

I have no skins or other packs active.

Thank you for your time, I love the game but this is a bummer..
I hope the team can fix this.