I do not know if it is a bug or just missing some code lines, but when I add an Apostrophe into the Product Name subject it shows a ' in the breadcrumb.
The breadcrumbs module is part of Joomla, isn't it? However, do you use a third party breadcrumb module (maybe also check your template)? I think normally VM product names don't show up in the breadcrumbs, perhaps unless to have an individual Joomla menu link for that specific product. You may also check if the language tag set in the breadcrumbs module matches your site language.
Thank you. I do not use a third party module. I will check into that.