Steps to reproduce the issue

Attempt to compile the Cassiopeia SCSS files.

sass scss/template.scss css/template.css
../../media/vendor/bootstrap/scss/_root.scss:4: Invalid CSS after "...lor}: #{$value}": expected "{", was ";" (Sass::SyntaxError)

sassc scss/template.css css/template.css
Error: Invalid CSS after "...mplate-columns:": expected expression (e.g. 1px, bold), was "[full-start] minmax"
on line 17 of scss/blocks/_css-grid.scss

Expected result

compiled css

Actual result

errors (above)

System information (as much as possible)

Joomla 4 alpha 3
PHP 7.2.5
Sass 3.4.23
sassc: 3.4.5
libsass: 3.4.8
sass2scss: 1.1.1
sass: 3.4

Additional comments