由wp_editor创建的textarea中设置的字体颜色不会保留更新（但在数据库中保持正确）

I created some meta boxes that use wp_editor to create rich-text fields (which are retrieved via WordPress' get_metadata(). When I use the TinyMCE buttons to make a word a specific color, it saves it and shows on the website as that color. but when I go to the page editor again, it shows in the TinyMCE box as black and if I click to update, it now makes the text show black on the website. Why is it not saving the color information?

wp_editor( 
    $savedValue, 
    "myTextBox", 
    array( 
        "wpautop" => false, 
        "media_buttons" => false, 
        "textarea_rows" => 5, 
        "quicktags" => true, 
        "tinymce" => array( "height" => 250 )
    )
);

When the form is submitted, in Javascript if I check the value it shows that word with the tags:

<span style="color: #00ffcc">word</span>

But after it's been updated and reloaded back into the TinyMCE box, it's now just:

<span>word</span>

Some Wordpress code was removing quotation marks.