On Mar 29, 2023 I received an update from QBO:

Dear M***** T******,

Good news, the investigation QBO Auto-Creating Suppliers Through Online Banking has been resolved for QuickBooks Online. If you are still experiencing this unexpected behavior, we would ask you to reach out to your online support team for further assistance.

Thank you for being patient with us while we worked to resolve this issue for you!

This is in reference to support contact Case Number 1595246090

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I haven't been getting any new suppliers with my last 2 banking updates. Looks promising.

Can anyone confirm? Cheers!