Is there an upper limit to the number of nodes in ComfyUI's workflow?

My workflow already has a lot of nodes, and one day I found that I couldn't add new nodes when I was modifying it.

If I delete a node at this point, I can add a node, and then I can't continue to add it.

No file, test, browser, or workflow is named. Start by reproducing the failure with a large workflow and verify whether deleting one node consistently permits one more addition; done means identifying the node-count limit or failure cause and confirming that the intended node additions work reliably.

Written by the indexing model from the issue text.