Hey @MutedJam
Yes, it works fine when executed manually. I have configured n8n to run on multiple containers via docker (1 main, 1 webhook and 2 processing containers). When executing manually, it runs on the main and is working fine. When triggered, it hits the webhook container and I receive the error above, that it is an unknown node.
When accessing my workflow, my custom node appears fine and can be configured without any issue