Letter 🅱️ prints as ¥ in MacVim (but not in terminal Vim or less)

Try typing 🅱️ (or opening a text file with that in it) in MacVim. It will display it as ¥.

If you inspect the character with :ascii you see it is the correct character in the status line, albeit it displayed as the text version of the emoji. Writing the file correctly writes it as 🅱️, it just displays as ¥.

Opening it with Vim on Terminal.app displays it correctly, as does with less.

Here's my MacVim version

VIM - Vi IMproved 8.1 (2018 May 18, compiled Aug  8 2018 18:09:39)
macOS version
Included patches: 1-235
Compiled by Homebrew

I use font Menlo.

Here's my Vim version (it's the same one)

vim --version
VIM - Vi IMproved 8.1 (2018 May 18, compiled Aug  8 2018 18:09:39)
macOS version
Included patches: 1-235
Compiled by Homebrew

I'm running on macOS High Sierra version 10.13.6 (17G65).

まず、Menlo フォントを使用して macOS High Sierra 上の MacVim で表示の問題を再現し、次に同じ絵文字を Terminal Vim と less で比較します。:ascii と保存したファイルを使って文字が正しいままであることを確認します。🅱️ が書かれた文字を変更せずに ¥ ではなく絵文字として表示されれば完了です。