This is a minor issue, but when trying to add an already existing details page to any button (or anything else that can open detail pages), very often, no detail pages will show up. Reloading doesn’t solve the issue. The solution I’ve found is to click the “Create details page for ___” button, right under where the pages should be, then all of them will show up again, and I’ll delete the new one. Not a big deal, just a bit tedious.
Yes. I have run into this issue as well. They used to drop down with all existing details pages, which was better for usability, but they don’t anymore.
I found this bug too. Apparently, the solution is to keep that initial block when the details page is created. I just keep it with the title, and then add the blocks I want to the page. If I delete the default Details Block of the Details page, then I can’t access it through the actions section.