n8n - 💡(How to fix) Fix Edit Image Composite still throws "Stream yields empty buffer" on n8n Cloud 2.19.5

Describe the problem/error/question

The Edit Image node with operation Composite still fails on n8n Cloud 2.19.5 with the error:

Stream yields empty buffer

This matches the regression described in issue #29934 and fixed by PR #30088:

https://github.com/n8n-io/n8n/pull/30088

The PR summary says it fixes a regression introduced by #28970 where the Edit Image node's Composite operation throws "Stream yields empty buffer" on n8n v2.19.0+, and that the fix materializes the current gm pipeline into a PNG stream before applying the composite operation.

However, on my n8n Cloud instance running 2.19.5, the same error is still reproducible.

What is the error message (if any)?

{
  "errorMessage": "Stream yields empty buffer",
  "errorDetails": {},
  "n8nDetails": {
    "n8nVersion": "2.19.5 (Cloud)",
    "binaryDataMode": "filesystem",
    "stackTrace": [
      "Error: Stream yields empty buffer",
      "    at Socket.<anonymous> (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/[email protected]/node_modules/gm/lib/command.js:56:21)",
      "    at Socket.emit (node:events:520:35)",
      "    at endReadableNT (node:internal/streams/readable:1729:12)",
      "    at processTicksAndRejections (node:internal/process/task_queues:90:21)"
    ]
  }
}