Hang and log spam when making changes to a landscape material with the landscape editor open

Editor hangs if changes are made to the material which is currently assigned to a landscape while the landscape editor is open.

Also spams "LogMaterial: 0.03 seconds spent updating 1 materials, 1 interfaces, 0 instances, 1 with static permutations."

Probably also affects older versions, but unconfirmed

1. Open QAGame
2. Create a new landscape using the test landscape material
3. open the landscape material while the landscape editor is still open
4. make some change, then press "apply changes"
5. hang

[UE-23848] Bug Status

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

Fix UE-51650

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