Before today, or yesterday, Bedrock realms were restricted to a simulation distance of 4. Now they are running at simulation distance 10. The increased capacity is great, except that now you cannot choose a lower simulation distance even if you want to. If you upload to your realm a world with simulation distance lower than 10, it gets changed to 10.

Steps to reproduce

1. Create a new world with simulation distance 4, 6, or 8.
2. Upload the world to a realm.
3. Observe mob spawns, or create a command block system to mark mob spawns with blocks, or track mob despawns (e.g. by having them say "hi" as you move away).
4. Download the realm.

Expected results

The world runs on realms at the simulation distance you set it to. Mobs spawn and despawn accordingly. When you download the world it is still at the simulation distance you set it to.

Actual results

The world runs on realms at simulation distance 10. Mobs spawn and despawn accordingly. When you download the world it is at simulation distance 10.