`--samples_per_plugin "images=0"` is documented to show all images, but shows no images at all

The TB 2.8.0 help says I can pass --samples_per_plugin "images=0" to show all images, but that actually shows none at all.

tensorboard --help

--samples_per_plugin SAMPLES_PER_PLUGIN.
An optional comma separated list of plugin_name=num_samples pairs to explicitly specify how many samples to keep per tag for that plugin. For unspecified plugins, TensorBoard randomly downsamples logged summaries to reasonable values to prevent out-of-memory errors for long running jobs. This flag allows fine control over that downsampling. Note that 0 means keep all samples of that type. For instance "scalars=500,images=0" keeps 500 scalars and all images. Most users should not need to set this flag.

import tensorflow as tf

with tf.summary.create_file_writer("tmp").as_default():
    tf.summary.image("Random image", tf.random.normal((1, 28, 28, 1)), step=0)

tensorboard --logdir tmp # shows the image
tensorboard --logdir tmp --samples_per_plugin "images=1" # shows the image
tensorboard --logdir tmp --samples_per_plugin "images=0" # does not show the image - this is the bug.