In https://chromium-review.googlesource.com/556345 we added support for focusing the sheet title upon transitioning to a different sheet, which is meant to indicate that the user has transitioned to a new context. For reasons that are thus far unclear, this fails to occur sometimes, usually when pushing a new sheet to the stack, though curiously not when pushing an editor sheet. Further navigation correctly moves to adjacent elements, but the initial landing spot is not highlighted/read out.

Prior testing includes logging state about the title (visibility, location, accessible content, AX role) at push-time, which thus far has not revealed any obvious difference between working and broken instances.

Only tested on Mac/VoiceOver but may well happen on other platforms as well.