Originally by @magi42

Tree nodes show expansion indicators regardless of the setting.

This appears to be a theme problem - it only occurs with Valo, not with Reindeer. Reindeer deals with the setting by hiding the indicator on the v-tree-node-leaf, Valo doesn't.

It's also a bit odd that clicking an item where the expansion indicator would be located gives the item the v-tree-node-expanded style regardless of the setting. I would think that leaf nodes should never get the style. Also the aria-expanded attribute changes. I'd recommend fixing this as well, as the style could cause unexpected behaviour.

Imported from https://dev.vaadin.com/ issue #13643