I have just noticed in Photoshop 23.5.0 (mac OS 10.15.7) that the Triangle tool corner radius is not scaling correctly when using Export As. Rectangle tool appears to stay correct. Screenshot attached with Stroke at 20px, Radius at 40px, centre aligned. Both triangles at 0 and 90 deg rotation show increase in radius in Export As preview when scaled here to 52%. This is the same in the final file.