Homebrew Warlock subclass: "does not have the necessary class features with the correct required levels".

Hi there!  I'm currently trying to publish an updated version of my homebrew 5.5e Warlock subclass, The Feeder.  The current version can be found at the following link:
https://www.dndbeyond.com/subclasses/2756948-feeder-patron

After clicking the "Create New Version" button, I updated some of the wording on the first feature the subclass grants, "Form of Rebirth".  However, after saving those changes on that feature and then clicking "Save Changes" again on the Basic Information page (as typically needs to be done to finalize any changes), the following error appears on the subclass: 

• This homebrew Subclass does not have the necessary class features with the correct required levels.

I'm unsure what's causing this particular error, since I made no changes to the number of features the subclass grants or at which levels they are granted.  The only change was to some of the wording on the first feature.  To review, I have a total of three subclass features at Level 3 (two actual features and one granting access to new spells), one feature at Level 6, one at Level 10, and one at Level 14.  I had no issues sharing the subclass publicly with these features at these levels before, so I'm unclear on what's preventing me from sharing the updated version.

Try adding a dummy feature at level 1, that sometimes fixes it (because the 5e version needed that).

Beyond keeps breaking these things, sometimes that works, sometimes it doesn't.