Woodpecker and Robin baseboards may implement a fan connector. Due to easy available fans on the consumer PC market the same connector has been used. (The 3 pin connector has been used, not the 4 pin connector)
Unfortunately the pinout in the schematic of the following carrierboards and documents is wrong:
In order to assure compatibility with consumer PC market fans the connector itself was assembled 180° turned. So, in the end the fan can be plugged and is working.
The 3 pin connector is recommended for carrierboard designs. The following picture of a 4 pin connector serves only as reference for the pinout numbering.