I just got a response and they added it to known issues:
App freezing on Samsung Galaxy Note 20 devices with Exynos chipset
Issue description: The Pokémon GO app freezes on Samsung Galaxy Note 20 devices with Exynos chipset.
Issue status: Resolved in an upcoming update
Yes! Can confirm this - v0.185.1 from the Samsung store seems to have fixed the issue for me too
Too bad it came too late to take advantage of the 10% off deal though...