LastModifiedBy not set for projection

[MeikelLP]

I'm quite new to Marten, DDD and event driven development so please bear with me.

I noticed that LastModifiedBy is not set on the Shop document (json) nor in its meta fields in the DB but on individual events. Am I doing something wrong? I followed the guide Working with Event Metadata

Here is a reproduction repo: https://github.com/MeikelLP/marten-last-modified-repro