Scroll lock behavior change from 2.0.x to 2.1 when using Transition + TransitionChild

[mzeitlin11]

What package within Headless UI are you using?

@headlessui/react

What version of that package are you using?

2.1.1

What browser are you using?

N/A

Reproduction URL
https://codesandbox.io/p/sandbox/silly-dust-mzj4cc

Describe your issue
After updating to 2.1.1 (to take advantage of the cool new transition features, thanks!), noticed dialogs using Transition and TransitionChild no longer lock scrolling.

• In the CodeSandbox link above using 2.1.1, the background can still be scrolled when the dialog is open.
• If you downgrade to 2.0.4 in the sandbox , the background cannot be scrolled.

This issue seems to have something to do with TransitionChild - I could not recreate it solely using Transition (but not checked too thoroughly).

[steve-marmalade]

Thanks @mzeitlin11 , I came here to report this exact issue. Were you able to find a workaround?

[Tittoh]

Looks like this has been resolved. I upgraded to 2.1.3 and it doesn't scroll anymore.

[short-dsb]

Unfortunately, upgrading to 2.1.3 doesn’t seem to be a workaround for us due to #3437.