[maximus-decimus]

He means it makes people question their sanity because they could have sworn the feature was right there.

[gtirloni]

Thanks, never saw that term used in this way.

[Ensorceled]

gaslighting is deliberately doing things to make someone question their memory, sanity or perception of reality. It's a technique often used in abusive relationships as a method of control but a lot of people now use it to mean "lying to you".

This may not exactly be gaslighting, since they may not have the intent of making you question your memory but ...

[gtirloni]

Thank you, much appreciated