SyncList Callback only called when changed, but not when first transferred to the client

I have a SyncListStruct for which I have a callback, which I declare on OnStartClient.

Everything works fine and it's syncing - but the callback is called only with the first change of the list(and following changes). When the client first receives the info, the callback is not called. Is there a way to have it called also when the client receives the list the first time?

Thanks.