New MQTT structure via lists kicks up parse error

[SirGoodenough]

The new MQTT Best Practice format complains when lists are used instead of dict.
Reference: https://www.home-assistant.io/integrations/mqtt/#manual-configured-mqtt-items

The following renders in HA and reloads/works fine:

[alior101]

Text also doesnt parse

[janchrillesen]

The new syntax was added to HA in july in home-assistant/core#94305
The examples in the documentation have also been updated to the new format, that doesn't validate in the current version - https://www.home-assistant.io/integrations/sensor.mqtt/

[frenck]

Works in the latest releases

[SirGoodenough]

This is a shot of today, right now and mine has an error.

Is it because I have multiple items listed with a - ?
I don't agree that it works today.
As far as HA the configuration works great to show a list of dicts. (or is it a dict. of lists, I can't remember)
HA 2024.10.1

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Current version: 5.17.0 (Changelog)