Inconsistent rendering of Liquid Arrays when using wagon serve

[greyskin]

The following:

{{ post.tags | join: ', ' }}
{{ post.tags | split: ',' | join: ', ' }}

when pushed to station.locomotive.works they are rendered:

item 1, item 2, item 3

["item 1", "item 2", "item 3"]

respectively. This is what I expect.

However, when served locally using wagon serve both are rendered:

item 1, item 2, item 3