Compiled engine missing World Partition

I just compiled the engine from the ue5-main branch. I know it’s highly unstable, but it compiled fine.
Problem is, it’s missing World Partition. Or, more accurately, there doesn’t seem to be a setting to enable it, as it is in the normal launcher downloaded engine.
In the project settings, in world partition there’s just, well… this:

Any idea why that is?

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World partitions are now also unavailable