Native resolution not available via USB-C ⇒ VGA adapter?

I'm connecting a Macbook Pro to a 1600x1200 display via Apple's [USB-C to VGA converter](https://www.apple.com/shop/product/MJ1L2AM/A/usb-c-vga-multiport-adapter) . By default it selects an appalling 800x600 resolution and the system settings only let me push this up to 1280x1024. The only tweak I could find is to enable "Show all resolutions" which does offer more options but nothing beyond 1400x1050, which looks horribly blurry. The adapter claims to support resolutions up to 1920x1080, which is slightly more pixels than 1600x1200, so I can't see a good reason why it would refuse to use the native 1600x1200. How can I convince the machine (running Ventura 13.2.1) to Do The Right Thing?