Fill thai language not Sync, How to solve?

Hello Andrey,

Reference : https://wpmudev.com/forums/topic/user-sync-problem-with-synchronization

I attached log files below.

Master site, Incase fill thai language (First Name, Last Name, Biographical Info, Customer Billing Address, Customer Shipping Address) a plugin not working and working when i fill back english language

Kind Regards,

Chanin