i had same issue and solved it by edit config.json as this

{
"url": "http://myurl.com",
"secret": "..................",
"database": "redis",
"redis": {
"host": "127.0.0.1",
"port": "6379",
"password": "?????",
"database": "0"
}
}

I was crating bug to GitHub, but thought that this could be know issue, after upgrade, so thats why added this question first... I did se you managed to do it fist, so I added information to there. I use tags, both 1.4.5 and 1.4.6 has this issue.

Upload cover picture does not work when using subfolder · Issue #5631 · NodeBB/NodeBB

Uploaded cover picture path does not contain the relative_path.

favicon

GitHub (github.com)

So I'n my opinion it is bug that it ignores categories for some people. How to delete those entries in MongoDB?