On an old test site with a custom breakpoint configuration upgrading to the 1.4.2 beta causes the breakpoint selector and canvas scaling to be completely disabled.
Note: On a different site with the tailwind style mobile first breakpoint configuration, this does not happen and it works perfectly.
I don’t believe we changed the logic behind custom breakpoints in 1.4.2-beta1 and this didn’t come up in our tests.
I’ll set up multiple test cases to see if I can reproduce it.