No HTML report is generated, no error is raised

I observe that there is no HTML report generated for my benchmarks. Processor Monitor shows that the benchmark exe is writing the final `benchmark.json` and then just exits. No anomalies in terminal output - just regular benchmark progress, no errors or warnings at beginning or end. Just no HTML output. This is on Windows 11, gnuplot is installed. Tested both Criterion 0.5.1 and 0.6.0. Steps to reproduce: * `git clone https://github.com/folo-rs/folo.git` * `cd folo` * `cargo bench -p nm` * Observe that the benchmark JSONs are correctly in `target/criterion` * Observe that the HTML report is nowhere to be found This "just worked" a few months ago, so it seems likely to be something environmental related to my local setup but I do not know where to continue troubleshooting. Suggestions most welcome!