Go to Settings -> General management -> Language and Input, now select “Samsung Keyboard” as the Default Keyboard.
Then go to On-screen Keyboard -> Samsung Keyboard -> Smart typing and TURN OFF “Predictive text” there.
Now try typing in H9 Control again.
I was able to try this briefly last week. Unfortunately, it didn’t work on the Galaxy Note8. I tried every iteration of the Samsung Keyboard & Smart Typing options. And it made no difference either way on the Galaxy Note9.
I (very briefly) winged it early this morning, and it seemed to be isolated to ser presets. Maybe genetically related to a “Patient Zero” corrupted template preset? I was focusing on Tricerachorus presets. Let me try a few more A/B/C/D options, and report back.