ALT / TILTE Brand Image Hover on Single product page

Hi G’s,

I have a question.

I enabled the opportunity to show Brand Images on single product pages. It works fine except for the ALT / TITLE HOVER on images.

On mouse over it shows the image-slug instead of the defined Alt or Title Tag.

This also appears on your own demo page. Please see screenshots for my website and your demo site.

How can I fix this?

Thanks in advance.
S. Bos, The Netherlands