Hey all - Local Beta 6.4.1 was released late last week, and it includes a fix for the regression introduced in 6.3.1 mentioned in the original post. I was out last week or I would have posted here sooner!
The download link is here: Local Beta 6.4.1
From our testing prior to creating the build, and now testing again with the published build, we believe the problem is fixed on MacOS. Our plan is to slowly roll 6.4.1 out to all users over the course of this week.
In the meantime, would anyone here be able to download the build, attempt creating a site and trusting the SSL and confirm it does as you’d expect? Always good to have more people confirming they’re seeing success!