The version of the updated scan engine starts with 2112330001; is this right? Should we be concerned that it seems to reference a date that does not exist?

The newly updated scanning engine is fully supported by Microsoft. While we need to work on this sequence longer term, the scanning engine version was not rolled back, rather it was rolled forward into this new sequence. The scanning engine will continue to receive updates in this new sequence.[0]

[0] https://techcommunity.microsoft.com/t5/exchange-team-blog/em...