In the Pipeline section of a pipeline project I have "Pipeline script from SCM" selected.

Upon initial creation of the project my options for SCM are Git, Subversion, and Plastic SCM. I can make a project and save and apply and it works just fine. Whenever I try to enter the configure menu again for that same project the Plastic SCM option is taken away and the default option of Git is selected. I can then no longer make any changes to the configuration of the project because I can no longer select Plastic SCM to pull my pipeline file from.

This starting happening on my first pipeline project, the freestyle projects seem to work with the Plastic plugin just fine.

If I try to create a new project through reproducing one of these projects that no longer have the Plastic SCM option available, the option will also not be available in the new project.

In the jenkins.err.log I'm noticing this popping up on the builds for that project once this starts to happen.

INFO: {project} #{build number} completed: FAILURE
{timestamp} org.jenkinsci.plugins.workflow.flow.FlowExecutionList unregister
WARNING: Owner{project}/{build number}:{project}#{build number} was not in the list to begin with: []
{timestamp} org.jenkinsci.plugins.workflow.job.WorkflowRun finish