First- a sincere thank you for the effort trying to assist! Very cool of you.
In case it helps anyone viewing in the future, I'll clarify point by point.
"S Pen to text" disabled as per above screenshots (in the location you mentioned plus three other similar instances).
No magnetic devices or attachments involved besides the tablet and pen.
Tip is fine, tested with one barely used pen and a new/never used pen.
No screen protector.
Stylus Handwriting in Developer Options disabled, as per above screenshots.
S Pen reset with no change
All factory and third party software up to date.
With all of the above being said, it doesn't seem plausible that the outcome could possibly be on the hardware side. The physical screen is recognizing the physical movements of the physical pen accurately. The element responsible for telling the physical processor not to register the movements of the pen in the specific instances at issue is the software. The hardware should not be able to override correctly coded instructions not to convert the movements within text input fields to handwriting (indeed, the hardware is not what does the conversion in the first place, only the recognition of the movements).
The only two logical options I see are:
Considering there are multiple, reduntant, difficult to find places where the user must instruct the OS not to convert pen movements to text, perhaps there is yet another, even-harder-to-find instance we do not yet know about. (This was my motivation for posting).
OR
Samsung was simply sloppy with their design and testing and there is no way to turn this off fully, despite being offered multiple ways of supposedly doing so. (Which, based on my experience with their software in general, seems FAR more likely, but that is out of my hands.)
