And note that "NLM Style Guide (Vancouver): Citing Medicine 2nd edition (citation-sequence)" is still available by default in Zotero.
(This change was made by the CSL project for all tools that use CSL styles. We weren't involved in the decision, but the logic is that "Vancouver", like "Harvard", is really just a shorthand for a system of similar styles, and even the organization that gave it the name "Vancouver" is now called something else. The NLM style guide is one of the most common implementations of the system.)
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https://www.zotero.org/styles?q=NLM style guide
(This change was made by the CSL project for all tools that use CSL styles. We weren't involved in the decision, but the logic is that "Vancouver", like "Harvard", is really just a shorthand for a system of similar styles, and even the organization that gave it the name "Vancouver" is now called something else. The NLM style guide is one of the most common implementations of the system.)