CoreText garbles ligatures

Snapshot 134, macligatures is enabled. The font I am using is PragmataPro. It's hard to describe what I am experiencing, so let's have a look at two gifs.

Here is entering !== without CoreText:

As you can see, everything looks fine. Here is the same with CoreText enabled:

As you can see, something is quite off here. The ligature gets broken somehow during working on the line. However, when changing the line, everything looks normal. Obviously, disabling CoreText is a perfect workaround, but since scrolling performance is somewhat horrible, I'd love to know if there is anything anyone can do here to resolve this rendering weirdness.

まず、CoreText と macligatures を有効にし、PragmataPro を使用して !== と入力して問題を再現します。CoreText を無効にした場合の動作と比較してください。編集およびスクロール中も合字が正しく表示され、スクロールのパフォーマンスが低下しなければ完了です。