I can confirm it.
System pretty much the same:
Intel Core i7 8700K
32GB RAM
GeForce GTX 1080 with latest drivers (536.67)
WQHD resolution, 75Hz GSync-compatible, ultra low latency mode (FPS capped to 73 by nVidia driver with those settings)
Windows 10 22H2, latest updates installed
With enhanced graphics engine FPS dropped from stable 73 to 47 after recent patch.
Switching to classic engine returns FPS back to 73
Turning on FSR2.2 with quality preset does the same, but with noticeable degradation of image quality because of ghosting.
Lowering SSAO Quality from high to medium sets FPS back to 73 on native resolution without FSR.
Switching game resolution to Full HD also sets FPS to 73 with SSAO high and FSR turned off.
Any other option (texture quality, etc.) does not affect performance.
Looks like SSAO shader with high preset became very resolution-dependent in current release.
As for now I switched SSAO to medium on native resolution, it looks better than SSAO high with FSR.