Updated to 4.9, won’t detect page template…

Wow. I lost an hour of development time before I found this thread and the trac ticket. Not happy about that.

I understand the reason caching was added, but did they not think about theme developers working on new themes or updates to existing themes. It would have been nice if they had worked in some sort of environment variable that gets checked to determine if the file list should be cached. No caching on local or staging but do the caching on production.

As I see this pop up now and then, and it serves no purpose for people to keep posting the same things about being unhappy with the update, I will be closing this thread ( and subsequent others about the issue, we’ve already got a ticket for it to see how we can improve the experience further).

I would like to mention that many many hours of volunteer time has gone into the release of WordPress 4.9, and we encourage user participation every step of the way, either with feedback, testing, or code.
We make weekly progress updates on what is going on at the Core blog (See the events for 4.9), and even had the full release schedule available including 4 weeks of betas and a week of Release candidates (which even shows up in the news widget in your dashboard), where we call for users to help run through things as it is just not possible for us to test, let alone think of, every possible scenario alone.