HISM is generated by ConstructionScript Actor is placed on the level and navmesh is generated on top of HISM. In UE5.2, the navmesh was generated without splitting on the HISM. In UE5.3, a break occurs in the center and the navmesh is not generated as expected. 

Steps to Reproduce

Open the repro project in editor with UE5.3


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ComponentUE - AI - Navigation
Affects Versions5.3.1
Target Fix5.4
Fix Commit29339253
Main Commit29339314
CreatedOct 24, 2023
ResolvedNov 7, 2023
UpdatedDec 1, 2023