Made an upgrade to the latest version from 1.5 and have stumbled upon an issue with webserver:
I am saving all artefacts to a custom s3 server. Used to work fine - saving and downloading them from webserver. Now I can now download anything that resides on s3 - getting the following errors in browser console:
Unable to parse "https None " as a whatwg URL.
ERROR EndpointError: Custom endpoint https [None](//storage.yandexcloud.net) was not a valid URI

Back at 1.5 there was an issue with custom s3 endpoints - to treat those as custom one needed to specify a port at the end - even it it is 443 - maybe that's the case?