Zero medals for event battle?

This is the second time this has happened to me today. It has never happened before today. How am I winning an event battle and receiving zero medals? What is the point in even doing a battle if you get nothing for winning?

After checking back after a few minutes, it appears my total did increase (with a lag) despite it saying zero added.

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Same thing happened right after the update. Always get credited the medals but the screen just reads zero.