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Because of assumptions in the DDC system about cooking being deterministic, we could under various circumstances end up in a situations where StaticMesh and the associated Nanite streaming data was coming from two different cooks. This could easily cause a crash as the StaticMesh chunk contains explicit page and offset references into the streaming data. Determinism fixes: -Added sorting step during initial clustering in the case where an edge is shared by more than 2 triangles. -Added sorting step to sort parent clusters after they have been generated. -Changed cluster GUID from 32bit to 64bit. When cooking CitySample there was one case where two clusters that were compared ended up with the same GUID, resulting in undefined order. -Initialized GUID in the cluster constructor that takes a list of clusters to merge. Before it would just be 0. -Added missing initialization of vertex color on fallback meshes that don't use vertex color. #jira UE-146347 #rb brian.karis, michal.valient #preflight 6238817789625f06129f616f #ushell-cherrypick of 19458684 by Rune.Stubbe #lockdown Marc.Audy #ROBOMERGE-AUTHOR: rune.stubbe #ROBOMERGE-SOURCE: CL 19467008 in //UE5/Release-Engine-Staging/... #ROBOMERGE-BOT: UE5 (Release-Engine-Staging -> Main) (v935-19464907) [CL 19468567 by rune stubbe in ue5-main branch]