Data component existence predicate doesn't work on some components

According to 25w41a changelog:

Item predicate in command form has been extended to accept empty predicates for any component type.
Similarily to component predicates in data, those empty entries only check for component existence.

However, some component predicates cannot be parsed correctly.

It happens to components with dedicated predicate that doesn’t allow empty object.
This behavior doesn’t match the phrase “for any component type” mentioned in the changelog.

Steps to reproduce

1. Run the command in chat: /execute if items entity @s weapon *[potion_contents~{}]

2. Run the command in chat: /execute if predicate {condition: entity_properties, entity: this, predicate: {slots: {weapon: {predicates: {potion_contents: {}}}}}}

Expected behavior

Either “test passed” or “test failed”, depending on what the player is holding.

Observed behavior

Both commands cannot be parsed.

The error message in command 1 is:

Malformed 'minecraft:potion_contents' predicate: 'Failed to parse either. First: Not a string; Second: Failed to parse either. First: Not a list: {}; Second: Not a string'

The error message in command 2 is:

Failed to parse structure: Failed to parse either. First: Not a string; Second: Failed to parse either. First: Not a list: {}; Second: Not a string missed input: {potion_contents:{}} missed input: {weapon:{predicates:{potion_contents:{}}}}