Can confirm this is happening still - have tried the creating another group with un-checked the box " Enable Automatic Distribution" and that did not send a build to TestFlight - Have also tried the add "Test" under review notes which did not work either. Apple really needs to address this ASAP

Known issue that Apple needs to address because this would be a blocker for a lot of teams that depend on Testflight https://developer.apple.com/forums/thread/721534?page=2