UE 5.5, Deleting a HISM During runtime causes 1 object in the hiarchy to blink in and out.

Development Programming & Scripting Blueprint
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I also have the same problem, but I have solved it now.
First, BuildTreeIfOutdated (false, true) must be called in C++immediately after the number of Instances changes，this way can fix Culling Problem.
Additionally, I noticed that when the number of instances changes, other instances in the Velocity buffer will suddenly change their Velocity

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so,Turn off motion blur in project settings and set motion Blur Amount to 0 in PostProcessing Volume
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I hope it can help you