Steam doesn't see games from EGS after launching them

I just switched from EGS to using Heroic for EGS games on my Windows machine. I expected everything to work like it does on a Steam Deck.

When I launch a game that's been added to Steam by Heroic on my Steam Deck, Steam features like Game Recording and Steam Input work like normal. When I try to add games on Windows, Steam doesn't record anything and doesn't show me as playing that game. Why?
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