[v6] Popover can't be dismissed #42339

Originally reported in our private v6 backlog document and also reported in https://github.com/orgs/twbs/discussions/42337

Description

On the v6 Popover documentation page (including when running locally), triggered popovers cannot be dismissed (except the "Dismiss on next click" that is working).

This issue occurs consistently across both mouse and keyboard interactions.

Version 6 behavior:

Expected behavior from v5: