As detailed in the linked UDN thread, if a server doesn't receive a network packet from a client in 1.5 seconds, it sets the client connection's ViewTarget to null. This will cause dropped reliable multicast RPCs due to a ViewTarget null check on in UIpNetDriver::ProcessRemoteFunction. Probably can't remove that check due to the issue in this thread:

Should at least make the 1.5 seconds configurable, and maybe consider whether we need it at all.

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Won't Fix
ComponentUE - Networking
Affects Versions4.10
CreatedDec 23, 2015
ResolvedAug 18, 2021
UpdatedAug 18, 2021