The bug
Custom text colors defined for an advancement title are overwritten by the advancement type default one in the hover text.
@dinnerbone: MC-117318: cough cough "and therefore also keep custom formatting" 😉
How to reproduce
Download the attached advancement
and place it in the following directory of your world folder
data\advancements\custom
Load the world
Grant yourself the advancement
/advancement grant @s only custom:title_test
Open the chat and hover over the advancement title
Linked issues
relates to 1
Attachments
Comments 5
Confirmed for 1.13.1.
Since I couldn't get the advancement to work in data, I made a datapack for it, i'll attach it to this report.
Can confirm for MC 1.12.1.