I have the same issue. The cure you mention does work for about a day, and then stops working again. I'm finding it quite annoying but thought it was a "just me" and my set up issue than an issue with the beta. Maybe it is something that will be fixed in the coming releases.I am running a MacBook Pro 14" M3 8GB machine with the latest version of Sequoia 15.0 Beta (24A5289h) and have found that although it will connect to my Apple Watch v8 11.0 (22R5309f) it will now not log me in from the screensaver.
Are there any ideas as to what I need to do to get it to work again - was working perfectly in Beta 1 & 2.
Thanks
I seem to have been able to 'cure' the problem. Turned the Watch login off , then rebooted and then turned back on again - seems now sorted.