Bad engine or transmission mount(s)?

I had a rough idle and jerking problem that was diagnosed as a collapsing engine mount. The jerking was whenever I was parked on an incline, I shifted into Drive and my car jolted. Very noticeable. It would jolt/jerk when shifting from Drive to Reverse, Reverse to Drive, etc.

So today Honda replaced the "collapsing" mount but the problem persists.

Does this sound like it could be a TRANSMISSION mount? Curious if they misdiagnosed my problem.

What could cause the large "jolt" when I shift from Park to Drive, Drive to Reverse, etc?

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