These are just the ones that I;ve noticed still existing, other people have posted more:
- Unit Shadows do not display in classic mode in custom maps
- Still no option to set a custom map preview image? (We had this in old Warcraft 3)
- “There was an Error Handling the Request” error message appears when loading a Reforged map and in score screen, error seems to serve no purpose.
- Archway doodad still shows as Stormreaver model?
- Heroes added through Reforged disappear when the map is next loaded (Example: Kelen the Seeker)
- Generally, Reforged custom games crash and are not at all as stable as their classic counter parts.
- Many Reforged unit models do not have a classic variant, rendering classic/reforged compatibility useless in maps which use them.