Lorena Pantano contributed to the nf-core/methylseq repository by addressing a critical bug in the bioinformatics pipeline related to FASTA index handling when bwameth was enabled during alignment and deduplication. She improved the pipeline’s robustness by ensuring the FASTA index channel was correctly formatted, which prevented markduplicate failures and eliminated unclear error messages. Lorena updated both the error handling logic and the documentation, making it easier for users to diagnose and resolve missing FASTA index scenarios. Her work leveraged Groovy and Nextflow for pipeline development, with Markdown used to clarify expected behavior and document the changes for future users.