Is Twitter Running Interference for Hillary?

I had noticed it before, but again, when I posted the following Tweet, I tagged Hillary in the photo:

The Pickle That Really Bites Back!https://t.co/Xq57eS5zwE #Hillary pic.twitter.com/HlU9gvgyYM

— Mike aka Proof (@ProofBlog) August 25, 2016

Hillary's name disappeared, as it had in several other Tweets I'd noticed. As a test, I posted an old Photoshop of Trump and tagged him:

Test. I want to see if Twitter removes #Trump's name when I tag him in a Photoshop pic.twitter.com/6AvcLKiYGu

— Mike aka Proof (@ProofBlog) August 25, 2016

His tag survived intact.

Is Twitter running interference for Hillary by refusing to tag any potentially embarrassing pictures or graphics bearing her name?
Inquiring minds want to know!

Update: Just for grins, I Tweeted Hillary to see if maybe she'd blocked me. Nope. That ain't the reason!