Block users banned from a channel from joining a raid from the channel the users are banned from to the raided channel, and also not notifying the banned users the name of the raid target channel (specifically the notification appearing on the top of the chat when the raid is about to happen).

As with a raid, the raiding streamer will be in the chat of the raided channel, and the raiding and raided channels usually have related communities, malicious users can use this opportunity to continue harassing the streamer or spreading damage to related communities, despite being banned from the previous channel. Therefore, allowing banned users joining raids exposes both the raiding and raided streamer to the risk of being harassed by previously known and banned malicious users.

I have recently witnessed an account maliciously disrupting the chat with inappropriate ASCII spam, and after the account was banned from the channel, the stream ends with a raid, and the same account attacked the raided channel with the exact same method, so this is a happening issue and actions should be taken against it.