[MC-271091] Can't parse particle options: No key item in MapLike[{}]

Cannot parse particle options when running this command:

/particle minecraft:item minecraft:diamond

Attachments

It works as intended.

In 1.20.5 changes,

Changes to minecraft:item options:
- Field `value` has been renamed to `item`
- Field `item` now also accepts plain item name to represent item stack with default components

Therefore,

/particle minecraft:item{item:"minecraft:diamond"}

will work fine.

Not a bug. The particle command format changed in 1.20.5.