When checking out the pre-release version out of curiosity, and playing with the advancement command, I found this bug
The Bug
Long advancement names gets cutted off due to the limited GUI space
Examples
"Cahaya di Hujung Terowong...dan Papan Tanda!" (Glow and Behold) only shows "Cahaya di Hujung Terowong...da" in the advancement screen
"Persahabatan Yang Menyembuhkan" (The Healing Power of Friendship!) only shows "Persahabatan Yang Menyembuhk"
"Burung Kakak Tua, Hinggap di Jendela" (Is It a Bird?) only shows "Burung Kakak Tua, Hinggap di Je"
Examples in the attached image
How to Reproduce
Change the language to
Bahasa Melayu (Malaysia)
Obtain the "Glow and Behold", "The Healing Power of Friendship!", and the "Is It a Bird?" advancements
[X] The advancement name gets cutted off
Linked issues
duplicates 1
Attachments
Comments 3

Oh is it? Thanks for informing!
Couldn't find an report about this before reporting

Thank you for your report!
We're tracking this issue in MC-166614, so this ticket is being resolved and linked as a duplicate.
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Hey there,
Your issue duplicates MC-166614 Advancements menu doesn't render titles fully, when they're longer than roughly 30 characters - Jira (mojang.com).