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There are a few possible reasons why the template file from a plugin is not being rendered accurately by Redmine 5 using Rails 6.1:

1. Missing helper methods: If the plugin is using Rails helper methods in the template file, but those helper methods are not available in Rails 6.1, then the template file will not render accurately. If this is the case, the plugin developer will need to update the code to use Rails 6.1 compatible helper methods.

2. View caching: Redmine has a view caching mechanism to improve performance, which can sometimes cause problems with templates that are dynamically generated by plugins. If this is the case, the plugin developer can try disabling view caching for the plugin or using a different caching strategy.

3. Changes in Rails API: Rails 6.1 includes some changes to the API, which may cause issues with plugins that were developed for earlier versions of Rails. If this is the case, the plugin developer will need to update the code to use the new API.

4. Missing dependencies: If the plugin has dependencies on other libraries or gems, and those dependencies are not installed or loaded correctly, the template file may not render accurately. The plugin developer will need to ensure that all dependencies are correctly installed and loaded.

To troubleshoot this issue, you can check the Redmine logs for any error messages that might indicate the cause of the problem. You can also try disabling other plugins to see if there are any conflicts with the plugin in question. Finally, you can reach out to the plugin developer for assistance in troubleshooting and resolving the issue.