fix: Duplicating null NetworkVariables#3891

EmandM wants to merge 2 commits intodevelop-2.0.0Unity-Technologies/com.unity.netcode.gameobjects:develop-2.0.0from

fix/null-networkvariable-duplicateUnity-Technologies/com.unity.netcode.gameobjects:fix/null-networkvariable-duplicateCopy head branch name to clipboard