Arabic shadda and out of position when it comes between ain and lam, and it prevents the ain and lam from connecting

Using Cairo variable, in this sequence, "فَعَّل," the medial ain will not connect to the lam. The shade (0651 + 0643) intervenes and sets in the wrong position.

**To Reproduce**
In InDesign (perhaps other programs as well), key or copy/paste the sequence with Cairo variable loaded and applied. Then Unload Cairo variable and load Cairo Regular static to see what the corrected sequence.

**Expected behavior**
The shadda should be centered above the ain.

**Screenshots**

**Additional context**
Working in InDesign 2025 on a Mac.