Gemma4 (31B, bf16) constantly fails to edit files due to mismatches in original text - just me?

I've been trying to find a good model to run locally, and in the benchmarks I can Gemma4 does well.

However, whenever I give it anything that involves writing any code, it sits in loops trying to edit files sending the wrong original content (usually it messes up something like the indentation) and the harness rejects it saying that code doesn't exist in the file.

I tried the same task in a bunch of different harnesses, hoping one of them would have an edit tool it could use, but they all seem to fail in similar ways. Some of those I tried are Goose, Copilot, Codex, Little Coder.

Is this a common issue? I've seen complaints about tool calling in general, but my issue seems quite specific to recalling the original content when editing files. I'm wondering if an edit tool that ignores indentation might be an idea.

I'm using Gemma4 31B, full bf16, served with VLLM. I have the updated chat template from a few weeks back (which did increase scores in the benchmarks I ran).