I fixed the bug you reported with this PR yesterday, which has been already merged and can be deployed if you update your Discourse instance:
https://github.com/discourse/discourse/pull/17329
However, we figured out that hard deleting topics could leave orphan small actions posts in the database. This second bug was fixed with:
https://github.com/discourse/discourse/pull/17359
I think everything should be working fine now. Please let us know if you have more problems.