How to customizing line-height in Angular Material buttons?

My theming Angular Material is:

@import "~@angular/material/theming";

$typography-config: mat-typography-config(
  $button: mat-typography-level(
    $font-size: 20px, // works
    $line-height: 30px, // DOES NOT WORK !!!
    $font-weight: 900, // works
  ),
);

@include angular-material-typography($typography-config);

Configurations of font-size and font-weight (buttons) works, but configuration of line-height (buttons) is ignored.

In browser console I see:

.mat-button, .mat-icon-button, .mat-stroked-button, .mat-flat-button {
    box-sizing: border-box;
    position: relative;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    cursor: pointer;
    outline: none;
    border: none;
    display: inline-block;
    white-space: nowrap;
    text-decoration: none;
    vertical-align: baseline;
    text-align: center;
    margin: 0;
    min-width: 64px;
    line-height: 36px;
    padding: 0 16px;
    border-radius: 4px;
    overflow: visible;
}
/* ... */
.mat-button, .mat-raised-button, .mat-icon-button, .mat-stroked-button, .mat-flat-button, .mat-fab, .mat-mini-fab {
    font-family: Roboto, "Helvetica Neue", sans-serif;
    font-size: 20px;
    font-weight: 900;
}