JOSM was not wrong, it was me not seeing the 26 off screen... sorry. I've restored the denotation tag from that level0 edit and chgd e to agricultural.

(the aù comes from the ù being right next to the invio key. Normally a is enough to fill out agricultural but then when hitting the ù instead of invio this happens. After that aù sticks in the past used values table and there it goes repeating. Clean that hist out in the editor. /o\
ciao