Im a Sion player and play him everyday for 3 years. There is a list of bugs that are not fixed:
1. His e push of minion can be still canceled by champion damage being your allies.
2. Tiamat does not proc at the time of his passive.
3. He can cancel the damage of rift herald on your tower if pushed at the time of herald charging.
4. Q is still rotating 90 degrees in random occasions when you quick cast it.
5. Minion pushed by e can rotate 90 degrees (only happened once and dont know the reason)
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