I'm trying to make a post with a continuing ordered list that used the HTML attribute for the <ol> tag of start="x". Here is a sample of the HTML code:

<ul>
    <li>
        <p>Background: Prismari Student which gives the Strixhaven Initiate feat (CHA)</p>
        <ol>
            <li>[spell]Fire bolt[/spell]</li>
            <li>[spell]Ray of Frost[/spell]</li>
        </ol>
    </li>
    <li>
        <p>Species: Variant Human take the Magic Initiate (Druid) feat</p>
        <ol start="3">
            <li>[spell]Create Bonfire[/spell]</li>
            <li>[spell]Produce Flame[/spell]</li>
        </ol>
    </li>
    <li>
        <p>Sorcerer 1 take the Aberrant Mind sorcerous origin</p>
        <ol start="5">
            <li>[spell]Mind Sliver[/spell] (from sorcerous origin)</li>
            <li>[spell]Chill Touch[/spell]</li>
            <li>[spell]Lightning Lure[/spell]</li>
            <li>[spell]True Strike[/spell]</li>
            <li>[spell]Poison Spray[/spell]</li>
        </ol>
    </li>
    <li>
        <p>Artificer 1</p>
        <ol start="10">
            <li>[spell]Booming Blade[/spell]</li>
            <li>[spell]Dancing Lights[/spell]</li>
        </ol>
    </li>
    <li>
        <p>Bard 4 take the College of Spirits bard college</p>
        <ol start="12">
            <li>[spell]Guidance[/spell] (from bard college)</li>
            <li>[spell]Blade Ward[/spell]</li>
        </ol>
    </li>
</ul>

The RTF editor is showing the start attribute of the <ol> HTML tag correctly:

But when saving the edit, it resets the start attribute to 1 each time:

The weird thing is if you save it and go back to edit the post, the HTML code still shows the appropriate start attribute correctly, it's just not displayed in the forum correctly.