Some people figure out the following…

await message.client.get_input_entity(message.original_update.channel_id))

…through event.stringify() (which contains original_update):

MessageDeleted.Event(
    original_update=UpdateDeleteMessages(
        messages=[
            123,
        ],
        pts=456,
        pts_count=1
    ),
    deleted_id=123,
    deleted_ids=[
        123,
    ]
)

This is of course awful, as they should instead be doing the following:

await message.get_input_chat()

(or even message.input_chat since now the library tries hard to always have the input chat).

So, changes to the way we represent certain things would be useful to avoid people from doing this