Application Name: Jackett
Application Site: https://github.com/Jackett/Jackett
Docker Hub: https://hub.docker.com/r/linuxserver/jackett/
Github: https://github.com/linuxserver/docker-jackett
Please post any questions/issues relating to this docker you have in this thread.
If you are not using Unraid (and you should be!) then please do not post here, instead head to linuxserver.io to see how to get support.
So the whole specifying a version is new to me, but here's how to do it for the uninitiated.
Based on github thread, I'm dropping back to tag 83 (from: https://hub.docker.com/r/linuxserver/jackett/tags/)
In the edit screen of the Jackett docker, turn on the advanced view (top right).
In the repository field add a colon + tag number so it looks like: linuxserver/jackett:83
This fixed the issues I was having.