It is not well documented in the Angular Material documentation, but Angular Material 15 moved the "legacy" CSS to a new file.
This means that, depending on whether CSS or SCSS is used, the legacy theme has to be added to keep using the legacy components without styling issues.
The legacy Angular Material components might be removed in a later version, though.
This means that, depending on whether CSS or SCSS is used, the legacy theme has to be added to keep using the legacy components without styling issues.
The legacy Angular Material components might be removed in a later version, though.
[0] https://stackoverflow.com/questions/75101022/angular-materia...
[1] https://developapa.com/angular-material-legacy-styles/