Carla-Control cannot connect on Windows

[ThatOtherAndrew]

I can't seem to be able to connect to a running Carla instance from Carla-Control, despite triple-checking that OSC is enabled, the programs are allowed through the firewall, the host and TCP/UDP ports are configured correctly, etc.

When using python-osc to manually send some OSC messages I can see that they successfully make it through to Carla from the console logs:

>>> client = udp_client.SimpleUDPClient('127.0.0.1', 22755)
>>> client.send_message('/Carla/1/set_parameter_value', 1)
>>> client.send_message('/Carla/1/set_parameter_value', 1)
>>>

~\Downloads
❯ .\Carla-2.5.8-win64\Carla\Carla.exe

~\Downloads
❯ Carla 2.5.8 started, status:
  Python version: 3.8.7
  Qt version:     5.12.12
  PyQt version:   5.13.1
  Binary dir:     C:\Users\Andrew\Downloads\Carla-2.5.8-win64\Carla
  Resources dir:  C:\Users\Andrew\Downloads\Carla-2.5.8-win64\Carla\resources
Frontend pixel ratio is 2.0
Failed to load JACK DLL, reason:
libjack64.dll: error code 126: The specified module could not be found.

[carla] CarlaEngineOsc::handleMessage() - failed to get plugin, wrong id '1'
[carla] CarlaEngineOsc::handleMessage() - failed to get plugin, wrong id '1'

However, Carla-Control just isn't working for me: