Redmine

Create a custom field for the Issue and check "For all projects".

When retrieving Issue custom fields in the Projects API, those with "For all projects" checked will not be retrieved.

• http://example.com/projects.xml?include=issue_custom_fields

<projects total_count="2" offset="0" limit="25" type="array">
  <project>
    <id>1</id>
    <name>a</name>
    <identifier>a</identifier>
    <description/>
    <status>1</status>
    <is_public>true</is_public>
    <inherit_members>false</inherit_members>
    <issue_custom_fields type="array">
      <custom_field id="2" name="Per Projects"/>
    </issue_custom_fields>
    <created_on>2023-06-07T09:45:45Z</created_on>
    <updated_on>2023-06-07T09:45:45Z</updated_on>
  </project>
  <project>
    <id>2</id>
    <name>b</name>
    <identifier>b</identifier>
    <description/>
    <status>1</status>
    <is_public>false</is_public>
    <inherit_members>false</inherit_members>
    <issue_custom_fields type="array"/>
    <created_on>2023-06-07T09:45:57Z</created_on>
    <updated_on>2023-06-07T09:45:57Z</updated_on>
  </project>
</projects>

I thought it should also be possible to retrieve those specified in "For all projects."
I have confirmed that the following modification will result in the intended behavior.

• projects_helper.rb.diff