[drawer] Dialog inside a drawer is registered as a nested drawer

[green-mint]

Bug report

Current behavior

In the nested drawers example, if the last nested Drawer is replaced with a Dialog, opening that dialog causes the parent drawer stack to behave as if another drawer was opened.

Repro structure:

Drawer -> Drawer -> Dialog

When the dialog opens from inside the second drawer:

• the first drawer's nested-stack animation runs again
• the --nested-drawers CSS variable increments

This makes it look like the dialog is being registered as a nested drawer.

Expected behavior

Opening a Dialog inside a nested Drawer should not affect drawer nesting state.

The parent drawers should remain visually stable, and --nested-drawers should not increment when the dialog opens.

Reproducible example

https://stackblitz.com/edit/xgcvvskx?file=src%2FApp.tsx

Base UI version

v1.3.0

Which browser are you using?

Chrome

Which OS are you using?

Mac OS

[github-actions]

This fix will be available in the next npm release of Base UI.

In the meantime, you can try it out on our Canary release channel:

npm i https://pkg.pr.new/@base-ui/react@4493