Sonos Integration - Task exception was never retrieved

I’m having a beast of a time getting Sonos to work again in my HA system. It was working for awhile, but recently failed to find/add my devices again. I turned on debug logging, and one common theme was this error here:

2023-07-07 02:57:33.455 ERROR (MainThread) [homeassistant] Error doing job: Task exception was never retrieved

<stack trace here>

xml.etree.ElementTree.ParseError: unclosed token: line 1, column 946

I am running this on a Unifi network, no VLANs, and my switches are configured for STP vs RSTP. I’m at a loss how to get this working again as HASS can clearly see the devices, but is struggling to set them up again. I am running 2023.7.1 as well.

This is running through a Proxmox 8 VM, but considering SoCo in the terminal AddOn can see the devices, I don’t think that’s the issue here.

I’ve attempted to do some nerdier troubleshooting by running python in the Terminal AddOn then importing SoCo and trying to find devices that way. This does succeed, so I think something wilder is going on right now.

Any help is greatly appreciated!