Markdown issues: Checkbox inside blockquote status won't be saved.

Summary

We are using issue templates in our projects. To separate different tasks and their sub-tasks we are using checkboxes inside a blockquote together with a normal text as a heading. At least that was the plan. Sadly checkboxes inside a blockquote in markdown are, while formatted correctly, not recognised as such. Meaning

  1. they don't count into total to-dos (X of XX tasks completed)
  2. their status will not change by clicking the checkbox.

Steps to reproduce

  1. Create an issue.
  2. Add checkbox inside blockquote: > - [ ] task
  3. Save
  4. Try to click the checkbox.

Example Project

See this issue

What is the current bug behavior?

  1. the checkbox doesn't count into total to-dos (X of XX tasks completed)
  2. its status won't change by clicking the checkbox. Instead it shows a seemingly unrelated error message: "Someone edited this issue at the same time you did. The description has been updated and you will need to make your changes again."

What is the expected correct behavior?

I should be able to check the checkbox and it should count into the total to-do count.

Relevant logs and/or screenshots

Checkbox warning

The preview renders the checkbox correctly, but it will not save! and be reseted after reload.

wrong numbering

Output of checks

This bug happens on GitLab.com