I came very close to what you did, I forgot to change feet and tried to do a zigzag stitch with my 1/4 foot still on.
Threw her out of timing I did. I was fortunate in that I did it when my Bernina was brand new and still under warrantee so the repair was no charge. Phew. It sounds like you also got off very cheaply. So happy to see it was such a simple fix as the needle not being in all the way.