UNET Bug when modifying SyncListStructs before AddPlayerForConnection

I have a rather huge UNET project where a player has several different SyncListStructs for items, equipment, skills, quests etc. I implemented my own OnServerAddPlayer function, which:

• Instantiates the playerPrefab
• Then loads the player data from the Database and writes it to SyncLists
• Then calls AddPlayerForConnection

Writing to SyncLists before AddPlayerForConnection causes my last two SyncListStructs (skills and quest) to be not synced to a client anymore, while...

UNET Bug when modifying SyncListStructs before AddPlayerForConnection