The EEC files reveal the existence of several RX 6600 XT models from ASRock, all of them coming with 12 GB of GDDR6 VRAM, This suggests that these versions may still be based on the Navi 22 SKU with 192-bit bus, but probably have low clocks that only require a single-fan cooler.
https://www.notebookcheck.net/First-mentions-of-AMD-s-Radeon-RX-6600-XT-with-12-GB-GDDR6-spotted-in-EEC-filings-from-ASRock.518520.0.html