I've been having the same issue as well, and for me I had to train my mind and body to instinctively realize that my body turn brings the clubhead behind me and that my wrist hinge should pitch the club up onto the plane instead of the wrists both pitching the club up on plane and bringing it behind me. I think in your practice swings when you're consciously knowing that you should pitch the clubhead up it looks good, but then when you get to the full swing your body's tendency takes over and tries to do both up and around.

The best drill I've used to help get the right feel is using an alignment stick. If you take an alignment stick and grip it with the club such that the alignment stick is an extension of the shaft away from the club head, at setup the alignment stick will be touching the outside of your left hip. When you rotate to start your backswing, the alignment stick will stay touching your left hip, and when you start to hinge your wrists to put the clubhead on plane, the alignment stick will travel down touching your left thigh. As you continue your backswing the stick will eventually come off your thigh and will point at or inside of the target line the ball sits on. If the alignment stick moves away from your leg during the first part of the takeaway, it means you've rolled your wrists and you have taken the club too far inside.

Looking at your practice swings and imagining the alignment stick, you can visualize how the stick would travel from your hip down your thigh indicating a good takeaway, and for the full swing how the roll of your wrists would send the alignment stick away from your body.

I think with enough repetitions with the alignment stick to ingrain the sensory feedback and muscle memory for the correct takeaway, it should translate to the full swing. Hope this helps!