Summary:
The inline help for Speed/Durability Settings for Multibranch Pipeline jobs isn't being shown on the Configure page. It can still be viewed in the global Manage Jenkins --> Configure System page.

Steps to recreate:
1. Have an existing MBP project. In my case, this is on a Bitbucket server, and has several branches on it. Note that before I observed this issue, I was using the previous betas, and had made several changes to the durability setting. So, this is not a brand-new MBP project.

2. As a user with the correct amount of permissions, go to the job's Configure page.

3. Under Behaviors --> Property Strategy, find Pipeline Speed/Durability Override. Look for the little icons to the right hand side of the screen - they are not there.

4. Go back to the main Manage Jenkins page, and select Configure System. Here, the inline help for Pipeline Speed/Durability Settings is present:

I've taken a guess at which plugin this issue belongs to.