Same. Tried to take hot jumper mare to a dressage show once and I was able to keep things relaxed in the warmup. As we trotted around the outside of the dressage ring before our test, she heard the bell and went into a canter, and I spent the rest of the test trying to convince her that she was allowed to do other gaits than canter, and that she needed to stop looking for the jumps.
The steward very kindly said during my tack check that she looked like she was ready to go and gallop a cross country test instead of asking me WTH I thought I was doing there. Needless to say, we did not score well.
I took a couple of other horses out dressaging, but was never crazy enough to make another attempt with my mare. She knew her job as a jumper and loved it, and that’s what we did.