Advancement titles that are longer than roughly 30 characters don't render the later characters in the advancement menu, but do render them in the chat announcement and toast.

It was expected there'd be a much higher limit, like with the description, or none at all.

To reproduce (custom advancement):

1. Simply create an advancement with a title or change an advancent's title to be 40 characters.
   • Alternatively, download and enable the attached data pack.
2. Press L to observer missing characters in the menu.

To reproduce (vanilla advancement, dutch):

1. Set the game language to Nederlands (Nederland).
2. Observe the advancement "The City at the End of the Game"'s name in the menu.
3. Get the advancement (or revoke it) and observe the title in the chat/toast.

To reproduce (vanilla advancement, malaysian):

1. Set the game language to Bahasa Melayu (Malaysia).
2. Observe the advancement "Glow and Behold"' s name in the menu.
3. Get the advancement (or revoke it) and observe the title in the chat/toast.

Screenshot note: yes, it may be dutch, but that's irrelevant to the report.