OAuth2 broken in LC 10 (dp6)

[Ben Rubinstein]

Am I doing something wrong, or is OAuth2 broken in LC 10? (Using dp6, but also 
true of dp5).

When I call OAuth2, it attempts to open a link in my default browser, instead 
of in a sheet on the stack. This doesn't display anything.

Same stack works fine in 9.6.10 and all earlier versions I've tried, opening a 
sheet which correctly allows me to authorise, logging in as necessary.

This is on Mac, in the IDE, on macOS 12.6.7.

I'm not sure if this something to do with 
https://quality.livecode.com/show_bug.cgi?id=23767.

Can anyone confirm, before I bugzilla it?

TIA,

Ben