Mandela effect stuff used to be just weird and silly, but in the last 5 years or so the internet has become centralized enough that it is actually possible to scrub all records of something from history, especially if it's something innocuous. That makes it very difficult to trust the corporations when they say "no, our logo never looked like x" when they might be actively lying about it.

Maybe their machine learning determined that in 3-5 years cornucopias would be deemed a symbol of oppression so they removed it to get out ahead. Or maybe some rich assholes son who was gifted a job as head of marketing just inexplicably hates cornucopias and wanted to scour them from the company. Or maybe through sheer incompetence, no one properly documented the logo change and everyone who was in the company has since moved on, so now everyone is like "hey according to our official records it was never like that" and they stick to that out of sheer corporate stubbornness.

Point is, for whatever reason, companies now have the capability of gaslighting people about this. You can still look up their old patent history, but that's about it unless you randomly find old pictures that happen to contain it.

I still think most of the time it's just common misremembered things from childhood.