Toast z-index css variable not used

Created by: manuelhenke

Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

The variable for the z-index of a toast gets defined here in .toast: https://github.com/twbs/bootstrap/blob/6e55fa929797a2d1d5250e1630615f515c45d0db/scss/_toasts.scss#L3

And it gets later used in .toast-container: https://github.com/twbs/bootstrap/blob/6e55fa929797a2d1d5250e1630615f515c45d0db/scss/_toasts.scss#L42

However, the documentation says that a .toast-container wraps the .toast element. Due to that the variable defined in .toast will never be available inside .toast-container:

• https://getbootstrap.com/docs/5.2/components/toasts/#stacking
• https://getbootstrap.com/docs/5.2/components/toasts/#placement

Reduced test cases

https://codepen.io/manuelhenke/pen/ExLgRvq

What operating system(s) are you seeing the problem on?

macOS, iOS

What browser(s) are you seeing the problem on?

Chrome, Safari, Firefox

What version of Bootstrap are you using?

v5.2.1