i’m currently going through this process with wpengine right now. while it’s really strange that they’re aggressively caching wp-admin, there’s likely a reason why it makes sense for them and the workaround is just to disable it while you’re working on a site. what baffles me, however, is that they’re caching wp-admin for staging sites as well. yikes.
i worked on a site last fall and made extensive use of acf and the flexible content add-on…didn’t experience these issues at all. i wonder what’s changed?
