Reproduced 3/3 times, issue also occurs in //UE5/Release-5.0 - CL 20979098 Binary. Confirmed NOT a Regression.

Issue does not occur for Listen Server players. It's likely that this is a replication issue, but even after making sure the actor & character replication settings were identical, issue still occurred.

Steps to Reproduce
  1. Create new ThirdPerson project.
  2. Create Blueprint Actor (name SomeActor).
  3. Place SomeActor in level.
  4. In BP_ThirdPersonCharacter:
    1. Create a new custom event
    2. Set Replication to Sever, and Reliable to True
    3. On custom event, attach Self to SomeActor
    4. Create key event to trigger custom event
  5. Set NetMode to Play as Client
  6. PIE
  7. Optional cmds (for debugging/helping demonstrating issue)
    1. p.netshowcorrections 1
    2. net pktlag=30

Actual Results: While Character is attached, there is a severe increase in lag. even after detaching, there is still some lag

Expected Results: No lag

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Won't Fix
ComponentUE - Gameplay - Player Movement
Affects Versions5.1
Target Fix5.3
CreatedDec 14, 2022
ResolvedMay 11, 2023
UpdatedMay 15, 2023