Nesting frames with autolayouts behaves erratically when making changes to width. Specific case is hard to determine. Seemed like changing width from “hug content” to “fill container” gave notification that something got changed to “fixed width”, but nothing actually happened (I know autolayout makes the “fixed with” change automatically in some circumstances, this is not that). Closing the file and reopening applied the change I tried to do.
Possibly relevant detail: The layout contains component instance that is replaced with instance of another component.
I’m fairly certain that this problem started recently.