Chain command block not working

Repeating/impulse command blocks can only activate a chain; they are not activated by a chain. Follow the arrow texture on the command blocks to determine the direction the chain travels. A chain command block can only be activated by a repeating or impulse command block or by another chain command block.

This is the same issue I had. Chain commands blocks after impulse or repeating command blocks have stopped working after the recent update, and only when they are removed and replaced is the problem solved