Beta client resizes itself upon every boot-up after patch 7.1

Previously, before this current patch, the client only resized itself whenever I was coming back from using the legacy client (Custom bot games). Now whenever I start the new client it's always resized to the smallest window size (1040x576) regardless of what I set it at last session.

Could have something to do with the most recent patches the the new client; just thought I'd bring it to your attention.