Seems like others also having Battlenet problems with this update, think it was different issues/errors though so chiming in as well:
Both working fine before update, after update I get…
Warcraft: Launches but when it tries to login immediately gives error blz51901016.
Overwatch: Tries to launch but gives ‘Could not locate resources’ same results if I try to ‘Run EXE inside wine prefix’ and point directly to Overwatch.exe. Tried reinstall same results.
Tried multiple DXVK versions no change. Both WoW/OW installed via Bnet app which was installed via Lutris install script.
There a 4.18 rpm somewhere? OpenSuse site/repo only has latest.