FormattedRelative server & client rendering are different

[hank7444]

I set the locale is ja-JP on server & client side just like the examples,

but server & client still render different result...

Warning: React attempted to reuse markup in a container but the checksum was invalid. 

This generally means that you are using server rendering and the markup generated 
on the server was not what the client was expecting.

 React injected new markup to compensate which works but you have lost many of the benefits 
of server rendering.

 Instead, figure out why the markup being generated is different on the client or server:

 (client) ".c8wu5255a8.3.0.0">in 4 months</span></
 (server) ".c8wu5255a8.3.0.0">4 か月後</span></h3><h3

[okuryu]

Could you put a reproducible example?

[ericf]

This is likely because the locale data isn't being loaded on the client so it's falling back to English.