Adding BlendAlphaSimplexNoise into an augmentation sequence fails to convert keypoints

[vonaviv]

Imgaug 0.4.0
Python 3.10

iaa.BlendAlphaSimplexNoise seems to cause problems when converting keypoints.

I have created an sequence of augmentations:

seq = iaa.Sequential([
    iaa.Affine(rotate=(-25, 25)),
    iaa.AllChannelsCLAHE(clip_limit=(1, 3), tile_grid_size_px=(10, 25)),
    iaa.BlendAlphaSimplexNoise(iaa.Multiply(iap.Uniform(0.7, 1.3), per_channel=True), size_px_max=(2, 16), upscale_method="nearest")
    # iaa.BlendAlphaFrequencyNoise(foreground=iaa.Multiply(iap.Choice([0.8, 1.2]), per_channel=True))
    ], random_order=False)

When I try to augment image and the corresponding keypoints with:

image_aug, kps_aug = seq(image=image, keypoints=kps_oi)

I get the error:

File ~/anaconda3/envs/dlc239-gui/lib/python3.10/site-packages/imgaug/augmenters/blend.py:757, in BlendAlphaMask._blend_coordinates(cls, cbaoi, cbaoi_fg, cbaoi_bg, mask_image, mode)
755 subgen = zip(coords, coords_fg, coords_bg)
    756 for coord, coord_fg, coord_bg in subgen:
--> 757     x_int = int(np.round(coord[0]))
    758     y_int = int(np.round(coord[1]))
    759     if 0 <= y_int < h_img and 0 <= x_int < w_img:

ValueError: cannot convert float NaN to integer

My keypoints include some NaN values (as a side note).

If I remove specifically iaa.BlendAlphaSimplexNoise there no error. For example If use iaa.BlendAlphaFrequencyNoise instead there is also no error.