I've found the same problem on my cluster at work.
On that cluster I had a custom ingest pipeline set up, so I removed that. It didn't change anything.
I double checked that I wasn't just filtering things out by accident by looking at the docker logs datastream index. For the one with the date 2023.02.22 on it, there are 0 docs. For the index from 2023.01.19, there are 6+ million docs.
My work cluster is running 3 8.6.1 nodes on Ubuntu 18.04, The agents that are supposed to be grabbing docker logs are installed at the system level. Not in docker.
Any ideas?
Edit:
this sure sounds like my issue, but how in the world did a mapping get messed up when I have been letting Elastic Agent/Kibana/etc manage all that for me?