Describe the bug

After the 0.25 update, the background overlay isn't showing above lower-level modals.

This can be seen in the docs site if you open multiple modals. The top modal is not putting overlay over the "lower" modal.
https://bootstrap-vue-next.github.io/bootstrap-vue-next/docs/components/modal.html#multiple-modal-support

Reproduction

https://bootstrap-vue-next.github.io/bootstrap-vue-next/docs/components/modal.html#multiple-modal-support

Used Package Manager

pnpm

Validations

• Have tested with the latest version. This is still alpha version and sometime things change rapidly.
• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
• The provided reproduction is a minimal reproducible of the bug.