Auto-merge broken from 31.53.1

[aablsk]

How are you running Renovate?

Self-hosted

If you're self-hosting Renovate, tell us what version of Renovate you run.

latest

Please select which platform you are using if self-hosting.

Bitbucket Server

If you're self-hosting Renovate, tell us what version of the platform you run.

7.17.4

Describe the bug

Dear renovate team,

thank you for this amazing tool!

Expected:
Renovate auto-merges renovate-branches with successful build.

Actual:
Renovate is unable to auto-merge branches (100% reproduction rate) for all of our projects. This includes gradle-based and npm-based projects with various dependencies being updated.

Supporting information:

1. We started seeing this problem during our first renovate runs this morning (UTC+1). We run renovate periodically between 8am (UTC+1) and 12 am (UTC+1).
2. We have been able to identify the release that seems to have broken this functionality for us: 31.53.1 (all following versions have the issue)
3. Versions before 31.53.0 (including) are working perfectly.

If there's any additional support I can provide, please don't hesitate to contact me!

Thank you for your time and effort!

Best Regards,
Alex

Relevant debug logs

Logs

INFO: Repository started (repository=<project>/<repository>)
       "renovateVersion": "31.53.1"
 INFO: Dependency extraction complete (repository=<project>/<repository>)
       "baseBranch": "master",
       "stats": {
         "managers": {"npm": {"fileCount": 1, "depCount": 26}},
         "total": {"fileCount": 1, "depCount": 26}
       }
 WARN: Unknown error when attempting branch automerge (repository=<project>/<repository>, branch=renovate/chai-4.x)
       "err": {
         "task": {
           "commands": ["merge", "--ff-only", "renovate/chai-4.x"],
           "format": "utf-8",
           "parser": "[function]"
         },
         "message": "merge: renovate/chai-4.x - not something we can merge\n",
         "stack": "Error: merge: renovate/chai-4.x - not something we can merge\n\n    at Object.action (/usr/local/lib/node_modules/renovate/node_modules/simple-git/src/lib/plugins/error-detection.plugin.js:30:33)\n    at PluginStore.exec (/usr/local/lib/node_modules/renovate/node_modules/simple-git/src/lib/plugins/plugin-store.js:21:33)\n    at /usr/local/lib/node_modules/renovate/node_modules/simple-git/src/lib/runners/git-executor-chain.js:95:45\n    at new Promise (<anonymous>)\n    at GitExecutorChain.handleTaskData (/usr/local/lib/node_modules/renovate/node_modules/simple-git/src/lib/runners/git-executor-chain.js:93:16)\n    at GitExecutorChain.<anonymous> (/usr/local/lib/node_modules/renovate/node_modules/simple-git/src/lib/runners/git-executor-chain.js:77:46)\n    at Generator.next (<anonymous>)\n    at fulfilled (/usr/local/lib/node_modules/renovate/node_modules/simple-git/src/lib/runners/git-executor-chain.js:5:58)"
       }
 INFO: PR created (repository=<project>/<repository>, branch=renovate/chai-4.x)
       "pr": 8,
       "prTitle": "Renovate: Update dependency chai to v4.3.5"
 INFO: Comment added (repository=<project>/<repository>, branch=renovate/chai-4.x)
       "prNo": 8,
       "topic": "Branch automerge failure"
 INFO: Repository finished (repository=<project>/<repository>)
       "durationMs": 3367

Have you created a minimal reproduction repository?

No reproduction repository

[renovate-release]

🎉 This issue has been resolved in version 31.57.1 🎉

The release is available on:

• GitHub release
• 31.57.1

Your semantic-release bot 📦🚀

[aablsk]

Amazingly quick fix! Feature is restored for our organization.

Thank you so much @rarkins @viceice!