Internal server error when adding WLED devices to a scene

Configuration Frontend
1

I have recently started getting an error saving a new lighting scene that contains a WLED device. If I remove the WLED device the scene saves fine. If I add these same WLED devices to an existing scene, it also fails. This issue persists across on multiple browser’s and also the HA Android companion app

There doesn’t seem to be anything in the logs that I can see, but I am not entirely sure where I should be looking.

This has been happening since HA 2025.11 or 2025.12 (I can’t remember, I only just got around to try troubleshoot it)

Any ideas how I can troubleshoot and resolve this?

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2

Turns out that my reverse proxy was preventing the POST as it was too large!