We have begun receiving numerous tickets from merchants experiencing issues across our apps related to the Product Search API. I believe this is isolated to 11.5.2 and is affecting POS product search in general.
Please see the attached video from a merchant illustrating issues with the built in product search of Shopify POS: https://drive.google.com/file/d/1EDIoxKvBaIYApxxKsWuu4U8szq14ggSd/view?usp=sharing