Pokémon Home was updated to Version 1.0.6 earlier today. The patch introduced small changes to the mobile application version of the title to improve the player experience.
The version update mostly targeted various bug fixes, but there also seems to have been one big update in terms of how the Global Trade System (GTS) is run.
The recent update seems to have finally removed the option to see Pokémon deposited in the GTS that ask for a Mythical Pokémon like Meltan in return, according to Serebii.
Mythical Pokémon like Meltan can’t be traded over the GTS. But the Pokémon Home application still allowed you to ask for such a Pokémon online as an option for trading, even though there was no way that the trade would ever happen.
The GTS has been swamped by players asking for Meltan, Melmetal, and other Mythicals since launch, but now it seems like those trades will no longer exist in Pokémon Home moving forward.