Bridgetown 1.2.0.beta3 has problems with plugins (feed, svg inliner, etc.)

Plugins in BT version 1.2.0.beta3 seem to be broken, i.e. after they are added, the subsequent runs of bridgetown generate exceptions.

Bridgetown Version: 1.2.0.beta3

To Reproduce

❯ bridgetown new bt-bug-project-1.1.0 -t erb
[...]
❯ cd bt-bug-project-1.1.0
❯ bundle add bridgetown-feed -g bridgetown_plugins
[...]
❯ echo '<%= feed_meta %>' >> src/_partials/_head.erb
❯ ./bin/bt build
          Starting: Bridgetown v1.2.0.beta3 (codename "Bonny Slope")
       Environment: development
            Source: /Users/pablo/Projects/bt-bug-project-1.1.0/src
       Destination: /Users/pablo/Projects/bt-bug-project-1.1.0/output
    Custom Plugins: /Users/pablo/Projects/bt-bug-project-1.1.0/plugins
        Generating…
        Pagination: disabled. Enable in site config with pagination:\n enabled: true
           esbuild: There was an error parsing your esbuild manifest file. Please check your esbuild manifest file for any errors.
  Conversion error: Bridgetown::Converters::ERBTemplates encountered an error while converting `_posts/2022-10-11-welcome-to-bridgetown.md'
  Exception raised: NameError
undefined local variable or method `feed_meta' for #<Bridgetown::ERBView layout=default resource=_posts/2022-10-11-welcome-to-bridgetown.md>
                 1: /Users/pablo/.gem/ruby/3.1.2/gems/bridgetown-core-1.2.0.beta3/lib/bridgetown-core/ruby_template_view.rb:72:in `method_missing'
                 2: /Users/pablo/Projects/bt-bug-project-1.1.0/src/_partials/_head.erb:12:in `__tilt_3860'
                 3: /Users/pablo/.gem/ruby/3.1.2/gems/tilt-2.0.11/lib/tilt/template.rb:181:in `call'
                 4: /Users/pablo/.gem/ruby/3.1.2/gems/tilt-2.0.11/lib/tilt/template.rb:181:in `evaluate'
                 5: /Users/pablo/.gem/ruby/3.1.2/gems/tilt-2.0.11/lib/tilt/template.rb:109:in `render'
         Backtrace: Use the --trace option for complete information.

Repo of the above is available

Current behavior Running build/start with feed and other plugin friends results in an NameError exception. Perhaps zeitwerk load paths changed/are overwritten?

Expected behavior Plugins should load.

Screenshots

Computing environment (please complete the following information):

OS: MacOS 12.6
Ruby Version: 3.1.2
Ruby manager: chruby

bridgetownrb / bridgetown

Bridgetown 1.2.0.beta3 has problems with plugins (feed, svg inliner, etc.) #639