Language taxonomy missing from post taxonomy selection

Hi,

I have an issue where there is no “language” option in the taxonomy selection options under the front-end from “taxonomy” field type.

There are only category, tag and formatting variants.

Site is using Polylang Pro plugin.

Reference: https://ww.wp.xz.cn/support/topic/acf-frontend-polylang/

What could cause this issue?

Best regards,
Verner