saguaros
OK, after code review it worked because we had:
$enable-negative-margins: true;
set in template 'local/variables.scss' and directly in the T4 Plugin t4-plugin\themes\base\vendors\bootstrap5\scss_variables.scss
After reverting changes from the T4 Plugin folder and compiling CSS, negative margins don't work.
So the question still stands, how do we enable negative-margins in T4 BS5 Blank template without changing T4 plugin files for example how to do it in T4 BS5 Demo?