Thank you for reporting the error. I've submitted a PR and it's been accepted. You can update your Zotero via the preferences or get the new style on the repository.

Since you're already in touch with the editors. Could you ask them to include the link to our style in their guidelines? https://www.zotero.org/styles?q=id:freshwater-biology
Thank you!


NB: They specify in their guidelines to use "doi:...", however they use https://doi.org/ in their actual publications now. It's a better format.