I extended the WA1 into extranet zone, but it is not enough to solve the problem... On the other hand, both the my sites and the profile pages are not reachable from WA2 extranet zone... :(
I think, the main problem is, that the WA2 extranet Public URL (https://extranet.company.com) can't be used for reaching WA1 sites in extranet zone...
Should I move the mysites from WA1 to... where?
I have no more idea... Please, help.