/help could output the command usages that are invalid

One example is /locate, which should have a literal directly following it.
When players enter /help locate , the following command usages are displayed:

/locate structure <structure>
/locate biome <biome>
/locate poi <poi>

However, if players enter /help locate s, the result becomes:

/locate s structure <structure>
/locate s biome <biome>
/locate s poi <poi>

Obviously, they are all invalid.

The same happens with any input: /help locate owo, /help locate a pickaxe, etc., unless the second token is structure, biome, or poi.

Another example is /teleport, which doesn't have a literal directly following it.
If players try /help teleport owo, it return nothing. But if players try /help teleport <, it results in:

/teleport < <location> ...

This issue occurs when the second token contains any characters that make com.mojang.brigadier.StringReader.isAllowedInUnquotedString(char) return false, or it’s length is greater than 16.