Cannot sketch on face of this "dog bone sign" extrusion

[franknoirot]

Describe the bug

I do not understand what is malformed about this file from our dog-house-great-dane sample that makes it so that I can't sketch on its end cap.

// Dog House (Great Dane) - Dog Bone Sign
// Parametric bone sign profile, extruded and wood-colored.

// Define units
@settings(experimentalFeatures = allow, defaultLengthUnit = in)

// Import and declare parameters
import * from "2x4.kcl"

// Bone profile parameters (adjusted for a thicker center bar)
boneHalfWidth = 6.06
boneNeckTopX = -3.31
boneNeckBottomX = -3.07
boneNeckTopZ = 3.6
boneNeckBottomZ = -0.6

boneTopLobeInterior = [-4.95, 5.08]
boneTopLobeEnd = [-6.06, 1.13]
boneBottomLobeInterior = [-5.04, -2.99]
boneBottomLobeEnd = [boneNeckBottomX, boneNeckBottomZ]

export signThickness = 0.75
export signWidth = boneHalfWidth * 2
export signHeight = boneTopLobeInterior[1] - boneBottomLobeInterior[1]

boneBottomOffsetZ = -boneBottomLobeInterior[1]

boneSketch = startSketchOn(XZ)
boneProfile = startProfile(boneSketch, at = [0, boneNeckTopZ])
  |> xLine(length = boneNeckTopX)
  |> arc(interiorAbsolute = boneTopLobeInterior, endAbsolute = boneTopLobeEnd)
  |> arc(interiorAbsolute = boneBottomLobeInterior, endAbsolute = boneBottomLobeEnd)
  |> xLine(length = -boneBottomLobeEnd[0])
  |> mirror2d(axis = Y)
  |> close()

dogBoneSign = boneProfile
  |> extrude(length = signThickness)
  |> appearance(color = woodColor, roughness = woodRoughness, metalness = woodMetalness)
  |> translate(z = boneBottomOffsetZ)

[dogBoneSign]
sketch001 = startSketchOn(dogBoneSign, face = END)

I get this error when attempting to select the end cap:

Error: Invalid artifact type for offset sketch plane selection: cap
    at getOffsetSketchPlaneData (index-D6X5hg9b.js:81017:61)
    at selectOffsetSketchPlane (index-D6X5hg9b.js:81058:47)
    at selectSketchPlane (index-D6X5hg9b.js:238587:55)
    at St.subscribeTo.callback (index-D6X5hg9b.js:238554:9)
    at index-D6X5hg9b.js:88979:76
    at Array.forEach (<anonymous>)
    at index-D6X5hg9b.js:88979:60
    at WebSocket.Ot (index-D6X5hg9b.js:88327:7)

Steps to Reproduce

1. Use the provided KCL
2. Click Start sketch in the toolbar
3. Select and end cap of the dog bone shape
4. Note how you cannot draw lines, etc

Expected Behavior

Normal sketch on face behavior working

Screenshots and Recordings

No response

Desktop OS

MacOS

Browser

Arc

Version

v1.1.16 (browser)

Additional Context

No response