The National Labor Relations Board for the third time extended the deadline to file comments on its “joint employer” proposal, pushing the due date to Jan. 28.

The NLRB in its Jan. 11 announcement cited the “unique circumstance” created by a recent federal appeals court ruling that upheld the Obama-era standard for joint employment that the board’s Republican members want to change.

In September, the board proposed a legal framework that looks at just the exercise of direct and immediate...