Noticed that the ability to add context about the event in the 'Details' section (e.g. text) seems to be hidden. Un-hid this using developer tools and it appears to have worked (text was still invisible but could at least type – See 'Release Pipelines...' event with the text 'Test').
Not very good with HTML, but this appears to be one of the spots that might be causing this:
Also, if possible, could we delete that Release Pipelines event? Would like to recreate it with real text, wasn't sure if it would go through.