Collapsible sections do not work with more than 500.06 KiB of log

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Summary

Using collapsible sections with collapsed=true does not work if the job log is longer than the truncation limit of 500 kb.

In this case, the section is not rendered but instead the whole log is shown until it is truncated after 500 kb.

Unfortunately, collapsed sections are especially helpful in scenarios where you have these kinds of large logs.

Steps to reproduce

Set up the Gitlab CI like this

stages:
  - test

Test Sections:
  stage: test
  script:
    - echo -e "\e[0Ksection_start:`date +%s`:my_first_section[collapsed=true]\r\e[0KHeader of the 1st collapsible section"
    # A command which generates a very long log
    - cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 120 | head -n 10000 || true
    - echo -e "\e[0Ksection_end:`date +%s`:my_first_section\r\e[0K"
    - echo "SUCCESS"

Example Project

This is the CI file: https://gitlab.com/PhilLab/ci-testing/-/blob/602cf0887d4381a33fb00cc35616068eafd7bb91/.gitlab-ci.yml

and this is the job run: https://gitlab.com/PhilLab/ci-testing/-/jobs/1510094915

What is the current bug behavior?

The section is neither collapsed nor even rendered. Instead, the last 500 kb log lines are shown together with the usual remark

Showing last 500.06 KiB of log

What is the expected correct behavior?

The section should be collapsed

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com