BUG: '@' sign in class-attribute value of block content changes to '-' sign when using template literals

GrapesJS version

• I confirm to use the latest version of GrapesJS

What browser are you using?

Firefox 108.0.2

Reproducible demo link

not possible in jsfiddle

Describe the bug

grapesjs-cli - 3.0.1 grapesjs - 0.20.3

How to reproduce the bug?

1. add a newblock with this template literal with a class attribute containing an @ sign

    bm.add('foo', {
        label: 'Foo',
        content: `                                                                                                                                 
        <div class="uk-width-1-2@m">                                                                                                               
          <div>some text</div>                                                                                                                    
        </div>                                                                                                                                     
    `,
    });

2. drag the block into the work area

3. the following div element will be created:

<div data-gjs-highlightable="true" id="igof" data-gjs-type="default" draggable="true" class="uk-width-1-2-m">
    <div data-gjs-highlightable="true" id="is7o" data-gjs-type="text" draggable="true" class="">
        some text
    </div>
</div>

4. other possibility to reproduce: open the code with Import tool and change a class attribute to contain an @ sign. save it. And then when you repoen the Import Template dialog the @ sign is replaced by a - sign

5. PROBLEM: see the class in the first div...

What is the expected behavior? the attribute value should not change, so it should stay with the @ sign: <div ... class="uk-width-1-2@m">

What is the current behavior? it changes the @ sihn to a -: <div ... class="uk-width-1-2-m">

If is necessary to execute some code in order to reproduce the bug, paste it here below:

    bm.add('foo', {
        label: 'Foo',
        content: `                                                                                                                                 
        <div class="uk-width-1-2@m">                                                                                                               
          <div>some text@</div>                                                                                                                    
        </div>                                                                                                                                     
    `,
    });

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