When I try to configure a new rule (for example visible based in new rule), in the modal, all dropdowns appears in the select with "Dropdown Field" label instead of real label. I attach an image.
I have tested in AEM 6.5 and it works correctly. I didn't see this issue as Know Issues. Please can you check it?
I have checked on AEM 6.5.12, 6.5.11 and 6.5.0 - and I can confirm I can see behavior you have described in your post. So it looks fine on 6.5.0 but is working incorrectly on 6.5.12 and 6.5.11. I did not checked other versions between 6.5.0 and 6.5.11 however there is a chance other ones are affect as well.
I have checked on AEM 6.5.12, 6.5.11 and 6.5.0 - and I can confirm I can see behavior you have described in your post. So it looks fine on 6.5.0 but is working incorrectly on 6.5.12 and 6.5.11. I did not checked other versions between 6.5.0 and 6.5.11 however there is a chance other ones are affect as well.