IIs my supervisor undermining me?

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8 mo
Is my supervisor undermining me?
My supervisor handed in their resignation. They have been told to train me by the manager because I will be doing their position. They are now teaching my fellow employee what to do aswell and I'm wondering why they are teaching the other employee when the manager told them I was the one they were supposed to be training.

They leave end of next week. What do I do?
Do I bring it up to my manager or just wait till she's gone?

IIs my supervisor undermining me?
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