Ah, OK - I had missed the soft-proofing aspect and I can also reproduce.
I am using Lr Classic 12.2.1 on Windows 10 22H2 build 19045.2788.
GPU is NVidia GeForce RTX 2060, driver 31.0.15.2698
Use graphics acceleration "Off": turn on Soft Proofing. Activate the Crop tool. Adjust crop boundary. When prompted, click on "Create Proof Copy". Resulting proofing virtual copy rhen displays correctly for adjusting the crop,
Use graphics acceleration "Auto": same steps. Except after creating the new p
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