Nativized blueprints cause error in multiplayer

Development Programming & Scripting Multiplayer & Networking
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I also have this issue. Steps to reproduce:

  1. Download the Epic Games network tutorial project (“SteamProject”) https://forums.unrealengine.com/showthread.php?118246-Steam-Blueprint-Multiplayer-Project-Files&p=570490#post570490
  2. Open it with Unreal Engine 4.16.3
  3. Build shaders etc.
  4. Package the project for Windows x64 twice to different locations, one with inclusive blueprint nativization, one without blueprint nativization (e.g. SteamProject and SteamProjectNativized).
  5. Start the nativized version. Host a game (use play method LAN).
  6. Start the non-nativized version (works on same PC). Choose “Find a match”, confirm join
  7. Client will disconnect immediately

Running the nativized version or the non-nativized version twice will result in successful connection.