News ticker – WCAG2.1 compliance

Hi,
We have this running on a couple of websites and the news ticker has a WCAG 2.1 Accessibility compliance issue.

An empty button was encountered. If a button contains no text, the function or purpose of the button will not be presented to the user. This can introduce confusion for keyboard and screen reader users. Switch to the Text view to locate and remove the empty tag or add an aria-label or title attribute with descriptive text. If the button includes an image that is missing alternate text, use the edit image option to add alt text to the image.

e.g.
<button><span class="bn-arrow bn-next"></span></button>
(all these buttons have the issue)

https://www.w3.org/WAI/WCAG21/quickref/?showtechniques=111#non-text-content

I assume the pro version also has the same issue?

Could you check this and update it please?
Thanks.