Recreation of Hangfire Services results in Jobs not getting queued in integration tests

I wrote a base class for integration tests of custom job filters.
The class completely recreates the DI-Container and the HangfireJobClient and Server for every test.
I currently have three tests for a cutom filter we use which all pass when run in isolation but as soon as I run them in one session (NUnit) only the first one passes. In subsequent test runs the job client won't return a job id when enqueueing.

Does hangfire keep some static settings in memory that has to be cleared for this to work?

the flow of the tests is as follow:

Register all relevant services (incl. hangfire) -> Create DI-Container -> Create JobClient & Server -> Run test method -> Dispose Server.

Start with the NUnit integration tests and the base class that recreates the DI container, HangfireJobClient, and Server for each test. Reproduce the sequence in one session, comparing isolated and subsequent runs; done means all three custom-filter tests enqueue jobs and receive job IDs consistently.

Written by the indexing model from the issue text.