Is there any ability in this game from any character, especially from this Sith Meta. That can prevent grand master Yoda from getting his bonus turn after masterstroke?
What you are likely seeing is that GMY crits Malak, gets feared by Malak's unique, gets his bonus turn, during which he can't do anything, and fear then expires. It all happens so quickly it would be easy to miss.
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He inflicts fear on anyone who crits him with one of his zetas. If GMY uses masterstroke and crits DM, he'll miss his bonus turn.
What you are likely seeing is that GMY crits Malak, gets feared by Malak's unique, gets his bonus turn, during which he can't do anything, and fear then expires. It all happens so quickly it would be easy to miss.