Hmm I can't seem to get this filter to work

[kevdogg]

I can't seem to make this work. Using jekyll 3.8.5

Gemfile

source "https://rubygems.org"
# Hello! This is where you manage which Jekyll version is used to run.
# When you want to use a different version, change it below, save the
# file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
#
#     bundle exec jekyll serve
#
# This will help ensure the proper Jekyll version is running.
# Happy Jekylling!
gem "jekyll", "~> 3.8.5"
# This is the default theme for new Jekyll sites. You may change this to anything you like.
#gem "minima", "~> 2.5"
gem "jekyll-remote-theme"
gem "jekyll-liquify"

# If you want to use GitHub Pages, remove the "gem "jekyll"" above and
# uncomment the line below. To upgrade, run `bundle update github-pages`.
gem "github-pages", "~> 204", group: :jekyll_plugins
# If you have any plugins, put them here!

group :jekyll_plugins do
  gem "jekyll-feed", "~> 0.13"
end

# Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
# and associated library.
install_if -> { RUBY_PLATFORM =~ %r!mingw|mswin|java! } do
  gem "tzinfo", "~> 1.2"
  gem "tzinfo-data"
end

# Performance-booster for watching directories on Windows
gem "wdm", "~> 0.1.1", :install_if => Gem.win_platform?

#Travis Testing Block

Here is _config.yml file:

timezone: America/Chicago
include:
  - .env
title: Authelia Documentation
email: your-email@example.com
description: Testing travis
baseurl: "" # the subpath of your site, e.g. /blog
url: "https://sitedocs.domain.com" # the base hostname & protocol for your site, e.g. http://example.com
twitter_username: jekyllrb
github_username:  jekyll

remote_theme: pmarsceill/just-the-docs

plugins:
  - jekyll-feed
  - jekyll-liquify

permalink: pretty

search_enabled: true

search_tokenizer_separator: /[\s/]+/

heading_anchors: true

aux_links:
  "Authelia on GitHub":
    - "//github.com/authelia/authelia"

footer_content: "Copyright © 2020 KevDog"

color_scheme: nil

markdown: kramdown
kramdown:
  syntax_highlighter: rouge
highlighter: rouge

exclude:
  - .sass-cache/
  - .jekyll-cache/
  - gemfiles/
  - node_modules/
  - vendor/bundle/
  - vendor/cache/
  - vendor/gems/
  - vendor/ruby/
  - Rakefile

And here is my testing file:

---
layout: default
tags: ["test", "authelia"]
permalink: /pagenumber/
pagenumber: 99
nav_order: 99
title: "Page Number {{ page.pagenumber }}"
---

The page number is: {{ pagenumber | liquify }}

I'm a little stuck what to do. The output of {{ pagenumber | liquify }} is blank.

[fdq09eca]

same here, followed the instruction, even in the jekyll new some_project environment it still not appears anything.

[rafasgj]

For me, it works locally, but not on GitHub Pages.

[turneja]

FYI - this works.... https://fettblog.eu/snippets/jekyll/liquid-in-frontmatter/