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Here's what's happening under the hood with that remote: Internal Server Error rejection, along with a few non-destructive ways to diagnose and work around it without altering your commit history or using --force.

What usually causes this

When Git successfully negotiates and uploads objects (Writing objects: 100%) but fails at the ref update stage ([remote rejected]), it means your local commit object is intact, but GitHub's server-side pre-receive pipeline crashed while inspecting the incoming delta.

The most common causes for this server-side crash are:

1. GitHub Server-Side Hook/Worker Timeout
   If your single commit introduces a large file, a massive diff, or a complex structural change, server-side syntax indexers or internal hooks can time out while evaluating the ref update, bubbling up as a generic 500 error.

2. LFS Pointer / Large Object Conflict
   If a file in commit c215d01 crosses size thresholds or matches Git LFS track rules without proper LFS pointer metadata, GitHub's ingest hook can crash when trying to reconcile it.

3. Intermittent Storage Cluster / Database Lock
   The two distinct Request IDs (133F:... and 1328:...) confirm the request hit GitHub's edge proxy, but the backend RPC write to the git partition timed out or hit a write-lock condition.

Safe read-only checks (No history changes)

Before trying another push, run these local read-only commands to inspect what payload c215d01 is actually sending:

1. Inspect the commit size and touched files

Check if your commit inadvertently bundled heavy binary assets or an unexpected number of files:

git show --stat c215d01b1fa3823a4a13838114f737b0d9a63e7c

2. Scan for untracked large blobs

Verify if any individual object inside your commit is pushing limits or missing LFS pointers:

git diff-tree --no-commit-id --name-only -r c215d01 | xargs -I {} ls -lh {}

3. Run Git self-diagnostics locally

Ensure your local ref database isn't pushing corrupted object loose headers:

git fsck --full

Non-destructive workarounds to try

Since you shouldn't use --force or reset your working branch, here are safe ways to test and bypass the server error:

• Test push on an isolated feature branch:
  Push your local commit to a brand-new remote branch to see if the error is tied specifically to updating refs/heads/main:

  git push origin HEAD:refs/heads/debug-test-branch

  • If this succeeds, the issue is an internal ref lock on main at GitHub's storage layer. You can then open a Pull Request from debug-test-branch into main directly on the GitHub UI to let their merge queue handle it server-side.

• Retry via SSH (if using HTTPS):
  Occasionally, chunked HTTP POST payloads hit proxy buffer limits that throw 500 errors. Testing via SSH uses a native stream connection:

  git push git@github.com:GuitarHero24/novatoon.git main

• Wait out backend propagation:
  If this was triggered by a transient partition split on GitHub's backend, retrying after a short cool-down window often succeeds once the internal lock expires.