Mine is that at my age (barely made it into Gen Z on the old end) I just found out today that a Bo Weevil is an insect (beetle) and not some kind of mole or similar rodent.
No I can picture things in my head, just not as a vivid image. Images in my mind are vague and detail-less. Like dreams. Mostly I remember the emotions associated with the memory, not what my surroundings looked like at the time.
FWIW I have ADHD, so asking me to remember anything with any sort of detail is already a challenge enough as-is.