Good idea, but not quite. That key would probably work for this test, but it’s actually the second to last key processed in the top row (I’m pretty sure the last one is right control on the default layout). The keys are actually processed top to bottom, right to left, with the thumb keys first in each row on the left side, and last on the right side, and palm keys inserted in the third row of the innermost columns.
The easiest way to test for a scan-order bug is to use two keys that are side by side — the key on the right gets processed first. Or use two keys in different rows — the key that’s farther away from you gets processed first. Don’t use thumb keys, palm keys, or the innermost columns, because the order they get processed is hard to remember and in many cases, not what you would expect.