The IRS announced in a revenue ruling that it will let taxpayers stick with the original $6,900 contribution limit for family coverage. 

Quoted from SHRM Article: For HSA participants who had contributed the full $6,900 for the year and then withdrew $50 with earnings, "now you can put it back into the HSA if the HSA custodian accepts it," Sit explained. "If you decide to keep the $50 with earnings, you can go by the $6,850 limit and treat it as a normal withdrawal of excess contribution."

Sources:

SHRM Article

Forbes Article