I have two Steam Decks and see this same problem on both, and it also happens in the Linux desktop Steam client in big picture mode (in Endeavour OS/Arch). The store remains frozen until you restart the Steam Client.
This appears to have been fixed at some point. Discovery queue works fine now in Steam client 1702079146.
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Please describe your issue in as much detail as possible:
Discovery list is not working on deck mode, store stays frozen after trying to access through main page. Steam button continues to work. After that the only way to use the store is restarting steam client
Steps for reproducing this issue: