TYPO3 11 LTS with Blog Extension 12.0.1: Comment form breaks default language sys_page

[romanliedtke]

Bug Report

Prerequisites

• I can you reproduce the problem on TYPO3 v11.x

Description

I am using latest TYPO3 11 LTS with blog Extension. Then i setup a blog post with comment form plugin in default language and corresponding translation. Once I submit the comment form on the translated page my blog post returns a 404 error.

Steps to Reproduce

1. Setup blank TYPO3 11 LTS using the latest blog Extension
2. Configure site using default language and one translation
3. Setup blog post with comment form in default language and translation
4. Submit comment form in translation

Expected behavior:

Comment is correctly added to Blog and im returned to the current blog post.

Actual behavior:

A 404 error occurs in the default language and the translation.

Versions

TYPO3 11.5.30
Blog extension 12.0.1