For the last week, so just a few days before 1.17 and now into 1.17, every horse I attempt to tame that has naturally spawned in my survival Xbox One worlds, jumps only one block and at their max, two blocks. Everything else about them is normal, varying colors, speeds, etc.,  but every single one only jumps a max of two blocks. I've tamed probably 20 wild horses or horses that spawned in the pens of villages in this time on two separate worlds (one world in 1.16 and one world in 1.17) and they're all the exact same. They can barely get over fences.