Looks like there’s an issue with the deletion of Saved Plans with an apostrophe ’ in the name.
It is now possible to load and delete plans with single quotes in its name.
Thanks for reporting this.
Can confirm able to delete the impacted plan 
Looks like there’s an issue with the deletion of Saved Plans with an apostrophe ’ in the name.
It is now possible to load and delete plans with single quotes in its name.
Thanks for reporting this.
Can confirm able to delete the impacted plan