Created by: staszek998
As seen in the https://github.com/twbs/bootstrap/blob/main/scss/_variables.scss, the $enable-deprecation-messages variable (line 220) is set to true by default.
Direct permalink to the line 220 @ GitHub: https://github.com/twbs/bootstrap/blob/e79c8f3489527d7f5eef2bb3cf14856f26c49871/scss/_variables.scss#L220