3.9.0 Beta - Icon Anchor offset inconsistent

mapbox-gl-js version:
3.9.0 beta

browser:
Chrome 131

Steps to Trigger Behavior

I have a sprite that was created with a built-in offset to make it easier to overlay on another icon on a map
the sprite looks like this in mapbox

but actually is framed like this

on my map using < 3.9.0 (currently 3.8.0) the overlaid icons render like this

but in 3.9.0, the icon-anchor seems to be offsetting and appears like this

the pertinent part of my code being

    mapInstance.addLayer({
      id: "pointer-layer",
      type: "symbol",
      source: "vehicles",
      layout: {
        "icon-image": "vehicle-arrow",
        "icon-rotate": [
          "get", "bearing"
        ],
        "icon-size": [
          "interpolate",
          ["linear"],
          ["zoom"],
          10,
          0.4,
          16,
          0.85,
          22,
          1.6,
        ],
        "icon-allow-overlap": true,
        "icon-anchor": "bottom",
        "icon-rotation-alignment": "map",
      },
    });

Expected Behavior

Unsure if the 3.8.0 behaviour is as intended and 3.9.0 is broken or vice-versa but this is a change.

Start by reproducing the reported symbol-layer behavior with the supplied addLayer configuration, comparing mapbox-gl-js 3.8.0 and 3.9.0 beta in Chrome 131. Investigate how icon-anchor "bottom" interacts with the built-in sprite offset, icon rotation, and zoom-dependent icon size. Done means determining which version is correct and confirming consistent overlay positioning.