About six years ago I updated a laptop to 16gb of RAM that only officially supported 8gb, and I remember thinking "the greedy manufacturers lied! It works fine!" However, I was running Linux, and now upon reading this I wonder if I would have had the same issues if I had tried booting into Windows.
My old 2011 MacBook supports only 8GB officially - though the Intel chipset onboard will support 16GB - It's run happily with 16GB of RAM since 2012...
Oh yeah, I actually might have had that same model of MacBook, and I also think I put 16gb in there with an SSD; gave it to my brother in law. Amazing how well those things can hold up long term.