What's the opposite of The Mandela Effect called?

[Colon capital V]

Where instead of remembering something that was there but isn't, it's you never remembering something happened but apparently it did.
Is it still called the Mandela Effect or just really shitty memory?

 

[Shidoen]

Elephat-itits, where you remember things that never happened in the first place so clearly.

 

[Bone Santa]

If you're talking about a group of people forgetting something (like the Mandela effect is a group of people misremembering), then that is called social amnesia.

Although its hard to tell where amnesia ends and apathy begins.

 

[DankSmoker]

The Mandel effect, named after the voice from Bobby's World, the host of Deal or No Deal, and uhhh also he was in a movie with Fred Savage.

 

[I'm Not Racist Anymore]

That's just called forgetting something.

 

[BirdUp]

the alednam effect

 

[scallion]

Yeah like the 2006 Volleyball Incident

 

[Epic Fail Man]

It's called schizophrenia.

 

[I'm Retarded?]

I believe that's called "winning an argument on the internet", OP.