Polylang + YayMail Pro

Hi,
I have a problem with the YayMail Pro plugin, which is compatible with Polylang. Unfortunately, the YayMail Pro plugin does not work properly, emails are not sent in the correct languages ??set. I suspect that the problem is the Polylang plugin, in which the selected check in “Custom entry types and custom taxonomies” does not want to be saved at Email Template (yaymail_template). The check can be selected and saved, but after refreshing the page or going to another tab, the check is unchecked.

Has anyone had this problem? Any ideas for a solution?