Woocommerce Checkout Fields multi select

Hi, i got a problem of compatibility with the Woocommerce Checkout Fields multi select form input.

I added a multi select field in the order page, and whenever a user select options from the multi select i can’t see them in the order details.

I found out in the database that for each order made, the multi select field has two rows, one row which is empty, and the other one that has the information filled by the user. And when i delete the empty row in the database the information the information is showing up in the order detail.

I tried some troubleshooting steps and i deactivated plugins that are not essential for woocommerce, and i figured that when i disable Polylang for Woocommerce everything works fine (tried several times)

Can you help me with this ?

Here are some informations about the plugins versions :
– Polylang – Version 2.8.2 (Up to date)
– Polylang for woocommerce – Version 1.5 (Up to date)
– Flexible Checkout Fields – Version 2.5.3 (Up to date)
– Flexible Checkout Fields Pro – Version 2.1.2 (Up to date)
– Woocommerce – Version 4.3.1
– WordPress – 5.5.1
– PHP 7.2