Does macOS 11 Big Sur support FireWire?

I'm attempting to use legacy FireWire hardware peripherals in macOS 11 Big Sur. Apple has provided an OEM hardware dongle connectivity path that is confirmed working in macOS Catalina: 1. [Apple Thunderbolt to FireWire Adapter](https://www.apple.com/shop/product/MD464LL/A/apple-thunderbolt-to-firewire-adapter) 2. [Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter ](https://www.apple.com/shop/product/MMEL2AM/A/thunderbolt-3-usb-c-to-thunderbolt-2-adapter) Unfortunately, the one piece of FireWire hardware that I'm trying to use [does not appear to work](https://apple.stackexchange.com/questions/412516/external-isight-camera-with-m1-mac) in Big Sur (on an M1 Mac). Various threads online seem to indicate that FireWire products are either not supported in Big Sur or have various incompatibility issues. - [Oh, Firewire UA products are incompatible with Big Sur!!](https://uadforum.com/macos-11-big-sur-mac-m1-sub-forum/51675-oh-firewire-ua-products-incompatible-big-sur.html) To confirm: was FireWire support dropped in Big Sur, on Intel and/or Apple Silicon? Was there an Apple announcement of this change? Do any of your FireWire peripherals work in Big Sur? Has anyone tested a FireWire device and found it to work correctly?