The old "en" problem seems to be back. This is something I brought up a couple of years ago. I mention it here because it might be related to the new MFV4 handling.
I'm using a brand new OAM V4 Multilingual map, because I like the V4 goodness with better label handling, soon to be even better yet with un-truncated text. (I'm using the latest Pro, not beta.) The map is Hong Kong in this example, and a good POI to illustrate the problem is a restaurant at
https://www.openstreetmap.org/node/5977868688 .
Because the POI has
name:en but no
name tag, the restaurant name displays with "en" in front. Note that I've manually selected English for this map, so there's no need to point out when it's a language I'm already expecting.
Hong Kong, like Vietnam that I'd mentioned earlier, is littered with POIs with this mix of tags, and thus prefixed "en".
(PS, the map I'm using is so new, it doesn't even show up yet on the main OAM download page. I found it
here. EDIT: but you see the same effect with an older version.))