See the multiple ? where it’s supposed to say “骡车” (Mule carts) but the character “骡” is missing.
On the mule cart icon its a rectangle □ replacement glyph instead of questionmark.
Above is under simplified chinese, i checked for traditional chinese and its the same problem there.
This has been an issue since the release of DE2, every now and then, there can be a player who uses chinese characters in his in game name which is displayed as questionmarks, or custom scenarios/campaigns which uses unsupported characters.
Now that mountain royals dlc came out, this becomes part of the tech tree and anything mule cart related, and that is a problem that should NOT be ignored again.
Because it’s essentially making the game look so incomplete and crappy as the in game tech tree is unreadable on that part, for people who are new or doesn’t speak english, you don’t even get to know whether the “? cart” is an ox cart or a donkey cart or something else.
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(edit: search AOE2DE-FontGenerator on github because the link keeps getting censored fsr)
Above are some community efforts for a fix which you can try to contact (since i myself is no expert with fonts/glyphs)
Which should have been in the game to begin with.