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Same, even just a slight tilt forward would have helped, but a nearly perfect 45 degree angle becomes ambiguous, a slight angle (say 30 degrees?) would have been enough to still shot the number but disambiguate the directions.

Yep, you need to have a nonambiguous angle. This one didn't cause me too many issues personally so I'm guessing the angle isn't 45 degrees exactly, but here's an example of an isometric game with an angle that felt right https://itch.io/jam/gmtk-jam-2022/rate/1617762

You can hardly see a 3rd side but it felt comfortable which was a decent tradeoff. Additionally you can add an on-screen indicator separate from the die, or on hover to see all faces. In my game it wasn't isometric and didn't have any indicators unfortunately but there was an undo button so you could just check the sides by rolling easily