And / or is it a way of pointing us to the latest, or final software revision ?
Having found that you had a different bootloader, perhaps that could be taken as a clue that you had not reached final ?
If you were to search again for the latest ROM, in light of what you now know, perhaps you would find a software revision ahead of what you have running now, and includes the correct bootloader ?
Searching online it does seem folks were saying OTG was still flaky leading up to Kitkat, 4.4.4.
With /e/ running it might be interesting go to
Settings > About phone > Android version … and note the date quoted for Vendor security patch level. In searching for a different Samsung ROM, might you see if you find any software revision date in advance of that ?