Command syntax help behaves differently towards subcommands of /locate

The bug

The command syntax help does not recognize invalid structures, but does recognize invalid biomes.

How to reproduce

Type the following command:

/locate biome invalid

→ invalid biome turns red.

Type the following command:

/locate structure invalid

→  invalid structure doesn't turn red.

It's really confusing why they behave differently

Similar issue:

MC-124984