Multiple industry insiders and Twitter users have speculated that TSMC has run into several snags with its upcoming N3 process node. Hence, AMD may have to fabricate its Ryzen 8000 Zen 5 processors and Radeon RX 8000 RDNA 4 graphics cards on TSMC's 4 nm process.
https://www.notebookcheck.net/New-rumour-suggests-that-AMD-Zen-5-Ryzen-8000-processors-and-RDNA-4-graphics-card-are-unlikely-to-be-fabbed-on-TSMC-s-3-nm-node.602272.0.html