Hello Simon,
the KnlMsgArchive file would have been very helpful to check if all the errors were showing a similar call stack...
Still, let me have a look at the KnlMsg file - please use the following link for upload:
https://mdocs.sap.com/mcm/public/v1/open?shr=6niQeUqECJbmUJI0HPPsifIFQwBUHRqrjjUYPRGgYCg
Kind regards,
Thorsten