We currently have a Spamhaus SBL blacklisting for several /22 subnets ongoing, in total around 6k ip-addresses are affected. We are already in contact with Spamhaus to clarify whats going on. Most of the affected /22 even had almost zero abuse complaints in 2021 and were assigned to different customers. We currently suspect a bug or overreaction due to a few complaints for a single /24, which ended up in blacklisting those as collateral damage.