detect_edges() BoundsError: attempt to access 16-element Vector{Matrix{Float64}} at index [17]

Hello,

I encountered an error while attempting to use the detect_edges() function on FashionMNIST images.

Here's a test case:

using MLDatasets: FashionMNIST
using ImageEdgeDetection: Canny, detect_edges


x_train = [xy.features for xy in FashionMNIST(:train)]

for x in x_train
    println(size(x))
    detect_edges(x, Canny(spatial_scale=3))
end

The result:

(28, 28)
(28, 28)
(28, 28)
ERROR: LoadError: TaskFailedException

    nested task error: BoundsError: attempt to access 16-element Vector{Matrix{Float64}} at index [17]

Reproduce the failure with the FashionMNIST loop and detect_edges(x, Canny(spatial_scale=3)), then trace the detect_edges and Canny entry points involved in processing the 28×28 images. Done means the FashionMNIST examples complete without the BoundsError, with edge detection still producing its expected result.