UE 5.6.0 bug, convert level to world partition is not work

Engine Version:
5.6.0

Operation:

  1. create a “basic map”(non world partition)
  2. Menu—Tools—convert level
  3. select the “basic map”
  4. just click ok(use default setting, In Place=false)

Desired Result:

  1. convert to world partition in 30 seconds

Test result:

  1. Stuck on Progress at 0 of “Converting map to world partition…”

It works in 5.5.4 but Stuck in 5.6.0. It seems like a bug of 5.6.0