The problem:

When typing in a name of an in-game object as a command argument, Minecraft shows hints for possible argument values. Sometimes there are delimiters like underscore (_), dot (.) or colon (:). They are counted as delimiters and one can find an argument by a word coming right after such delimiter. However, it appears that slash (/) is not accounted for, despite it being another delimiter used in some object names.

The same issue was also present for dots before 24w09a, as reported in MC-186341, but in 24w09a this was fixed, meaning that slashes are now the only special character commonly present in commands that is not considered a delimiter.

Most importantly, that affects the advancements. The actual names of the advancements, known by the community, are located after a slash in the resource path, making them impossible to find by the first word of the name.

Steps to reproduce:

• Launch Minecraft in an affected version, create or join a world with commands on
• Pick an advancement (for example, minecraft:husbandry/whole_pack)
• Open chat and type in /advancement grant @s only
• Then add the advancement name after the slash (for example, /advancement grant @s only whole_pack)

Observed behaviour:

No hint shows up for the advancement

Expected behaviour:

One or several hints should show up, including the wanted advancement, the same way as minecraft:husbandry/whole_pack shows up when inputting “pack” or “husbandry/whole_pack”