I am a teacher. I have been on both ends of the spectrum. I have been taught inaccurate things, and I have been given inaccurate curriculums. The best source for curriculum errors used to be a book called Lies My Teacher Taught Me. It caused many districts to reevaluate their history programs. It mostly focused on whitewashed history in the US, but there are other examples especially in Japan.
The worst thing I have heard or witnessed being taught in the classroom recently was some of the politically charged things stated by teachers on both sides of the recent election and the subsequent riots at the capitol. I have heard students being taught that the riots were faked by the liberals and also that the conservatives were hoping to install Trump as dictator while revoking the constitution for a Nazi manifesto. I have also witnessed teachers suggesting that the Covid virus is anything from a collaborated attempt between the US and China to get us all to get vaccinations that will turn us into government controlled zombies to the idea that the virus does not exist at all.
I always tell my daughters to question EVERYTHING, regardless of who the teacher is.