In 10.9, I've noticed that if I create Arcade expressions within a web map, the resulting web map item page has a ton of extraneous text shown in the "Layers" section of the web map. It doesn't seem to affect the web map itself, but is there any reason for this extra text? The extra text seems to take on whatever the web map item name is, in this case, 'test'.
The screenshot below is an example.
