Going directly from a event node to a For node will result in the VM breaking after the first index. (First picture)

If you put a Debug.log (only tested with this) between the Event and For node it will work properly. (Second Picture)

[<color=yellow>UdonBehaviour</color>] Udon VM returned with error code: 1

https://gist.githubusercontent.com/PhaxeNor/79435e3698c24748ece7afe68a7ca7e6/raw/fb07806708e34a91de6dfac0b0c37b15776b4533/udon-for-loop-bug