Describe the issue
When the horizontal or vertical space to display the linked labels is too small, the labels are getting cut off. This is visible in the "Most basic" sunburst example, since it has long labels that display as linked labels:

cc @cchaos

Expected behaviour
I would expect one of two things to happen, depending on which is easier:

1. Labels would always push the main circle smaller to ensure that they are shown (this is what I thought was happening)
2. If the labels are too long, they would be hidden

I think 1. is my preference for Lens, but maybe there are use cases for 2.

Screenshots
If applicable, add screenshots to help explain your problem.

Version (please complete the following information):
18.3.0