Jobs Stuck in Enqueued State

I realize I'm not using the latest versions of things but these _were_ the latest versions when I started having this issue in production. But due to stdump issue [IndexOutOfRangeException - What am I doing wrong?](https://github.com/HangfireIO/stdump/issues/1) I could not get a stack trace dump when I had the latest version of the packages.

ASP.NET Core .NET 6
Hangfire.AspNetCore" Version="1.8.6"
Hangfire.Console" Version="1.4.2"
Hangfire.Core" Version="1.8.6"
Hangfire.Dashboard.BasicAuthorization" Version="1.0.2"
Hangfire.Mongo" Version="1.9.12"

[stdump_hangfire.txt](https://github.com/HangfireIO/Hangfire/files/14039621/stdump_hangfire.txt)

Classes have this attribute applied: [SkipWhenPreviousJobIsRunningAttribute.txt](https://github.com/HangfireIO/Hangfire/files/14039649/SkipWhenPreviousJobIsRunningAttribute.txt)

Execute Methods have `[DisableConcurrentExecution("{0}", 3)]` applied




Start by reviewing the attached stdump_hangfire.txt and SkipWhenPreviousJobIsRunningAttribute.txt, then trace how DisableConcurrentExecution interacts with jobs remaining enqueued. Reproduce the stuck-job scenario using the listed Hangfire and Mongo versions; the issue does not define a specific fix or acceptance test, so confirm the cause and expected behavior with maintainers before changing code.

Written by the indexing model from the issue text.