Custom Plugin Breaks Other Plugin Functions

Don’t inject JS or CSS directly like this; use WordPress’s enqueuing system instead.

add_action( 'wp_enqueue_scripts', 'wpse425304_add_css' );
function wpse425304_add_css() {
  wp_enqueue_style(
    'bootstrap',
    'https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css'  
  );
}

References

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