Text replacement doesn't work in Safari on one iPad
We have 3 identical iPads at work (5th gen iPad Pro). All are set up identically, as far as I can tell - I spent about an hour poring over any settings I could find that were even tangential to this. All are updated as of my check this morning. We have some simple text replacements set up, and they seem to work as expected, except on one iPad they don't work in Safari. If I use the iPad next to it, they work without fail. This has been occurring for about a year, as far as I can remember.
Have I missed a setting, or is there something else that might account for the difference, and why it seems to only show in Safari?
iPad Pro (5th generation)