Previously saved css rules not showing in Style Manager

Post the grapesjs config and its version

var editor = grapesjs.init({
    
    container : '#gjs',
    plugins: ['gjs-blocks-basic'],
    
   // protectedCss: '',

        storageManager: {
          type: 'remote',
          stepsBeforeSave: 10,
          autoload: true,
          urlLoad: base_url+'superadmin/educationalContent/get_learn_page/'+<?php echo $concept_id; ?>,
          contentTypeJson:true,
          params: {},   // For custom values on requests
        },

        assetManager: {
          assets: 
          <?php echo $new_images; ?>
     /*  'http://placehold.it/350x250/78c5d6/fff/image1.jpg',
       // Pass an object with your properties
       {
         type: 'image',
         src: 'http://placehold.it/350x250/459ba8/fff/image2.jpg',
         height: 350,
         width: 250
       },
       {
         // As the 'image' is the base type of assets, omitting it will
         // be set as `image` by default
         src: 'http://placehold.it/350x250/79c267/fff/image3.jpg',
         height: 350,
         width: 250
     },*/
    ,
    noAssets: 'No assets',
    upload: base_url+'superadmin/qsm/upload/uploadGrapes',
    uploadName:'file',
    autoAdd: 1,
    dropzone: 1,
  },



});

Version : 0.12.17

To try with the latest version