This issue is the result of me re-filing #2408 (comment) as a new issue.

Components that render partials that yield exhibit a double rendering bug.

It worked correctly on v3.x with config.view_component.capture_compatibility_patch_enabled = true. Broke with upgrade to v4.

Steps to reproduce

A minimal reproducible example:

# app/components/example_component.rb

class ExampleComponent < ViewComponent::Base
end

<%# app/components/example_component.html.erb %>

<%= render "shared/partial" do %>
  abc
<% end %>

<%# app/views/shared/_partial.html.erb %>

def <%= yield %>

Expected behavior

Output should be (not sure about line breaks):

<!-- BEGIN app/components/example_component.html.erb -->

<!-- BEGIN app/views/shared/_partial.html.erb -->def 
  abc

<!-- END app/views/shared/_partial.html.erb --><!-- END app/components/example_component.html.erb -->

Actual behavior

The actual output (with annotations by rails) is:

<!-- BEGIN app/components/example_component.html.erb -->
  abc
<!-- BEGIN app/views/shared/_partial.html.erb -->def 
  abc

<!-- END app/views/shared/_partial.html.erb --><!-- END app/components/example_component.html.erb -->

abc (component html) is output twice 🤔

System configuration

Rails version:
8.0.2

Ruby version:
3.3.5

Gem version:
4.0.0