Hello @chouby ,
Thanks for reply.
Honestly I found 2 plugins ( both are woocommerce payment gateways ) which causes this rewrite rule to appear ( after I will deactivate/activate polylang ). But I cant find the reason of conflict. That plugins have nothing to do with rewrite rules ( I checked in their sources ).
What you think they could have written in their sources that cause this conflict ?
Maybe you have some ideas …
Thanks