Does a familiar/steed/greater steed keep its memories between recasts of its find spell?

When questioned about polymorph Crawford offered:

A spell doesn’t erase/suppress your memories unless the spell’s text says it does.

When the text of a spell, like polymorph, says you retain your personality after a transformation, that’s a terse way of saying, “You’re still you, despite the radical changes you undergo.” #DnD

However the first and second statement seem to contradict each other for find spells. None of them say the spirit’s memories are erased/suppressed. But they also don’t say they retain their personality, which in the context of his tweet is how creatures remain themselves between transformations.