Shipping rates caching time limit for empty rates

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Is anyone seeing issues for CarrierService where empty rates get cached for longer than 30 seconds.  I tested on my store and it looks like it is caching for 15 minutes now.  Seems like this started around June 18, 2020.  Can anyone confirm if Shopify changed the time to live (TTL) for empty rates to 15 minutes? 


Previous link  shows that it is cached for 30 seconds, but seems like that have changed.  Can a Shopify Developer confirm this?