There is a scenario where delta struct serialized fast arrays can replicate changes that introduce additional elements to the array, but without changelists containing the new data.

This needs further investigation to determine an isolated repro case. It is a regression against the original replication behavior of fast array serialization.

See linked UDN thread for more information:

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ComponentUE - Networking
Affects Versions4.26
Target Fix5.1
CreatedJun 14, 2021
UpdatedOct 1, 2021