{SOLVED} 2.83.1 - evee - extrude a curve along another curve not working

UPDATE: It appears this is a bug and they fixed it in 2.83.4.

I used to be able to extrude a profile (closed) curve along a path (open) curve to produce a curved tube. Now, in 2.83, I cannot get this to work anymore. The path simply disappears when I try to bevel it with the profile curve. Is there a new trick or is this not working anymore?

Thanks for any clues.