Transform Warp: Cylinder -> constrain proportions not working (for me)

[michaelf83358296]

Hi,
I am happy I just found the new "Transform Warp: Cylinder" feature in PS.
Unfortunately "corner controls + shift" to constrain proportions is not working here.
Is this a known bug? 

Best regards,
Michael

[Earth Oliver]

Not working, how?

[michaelf83358296]

It simply doesnt constrain the proportions. It's scaling the x/y just like I wouldnt press shift while (and before) moving corner controls.