Job log viewer shows no sections to collapse

Description

Sections in the full log viewer cannot be collapsed, and the arrow icon to do so is missing:

regular logs	full log viewer
https://gitlab.com/runner-group-test/test-project/-/jobs/3645160003	https://gitlab.com/runner-group-test/test-project/-/jobs/3645160003/viewer

Note: Just in case, this is not related to FF_TIMESTAMPS feature flag, this is an old job log.