The elk layout produces an empty result

[jackrwright]

Describe the bug
Choosing the elk layout produces an empty result.

To Reproduce
Link to Live Editor: https://mermaid.live/edit#pako:eNpdkLFugzAQhl_FurHCCLChwUOWds2ULXUHCxywAnZkTBSKePe6dqNW8fTru8-nu1uhMa0EBhhjrhujz6pjXCOEBrGY2TEkhwvXoTo54eS7Ep0VI74VwUIfL58I4z06OjUMEYUYoC8-o4O5Kd1FGvPz93_0zYqpjzTER1NIYJR2FKr1k68_AgfXy1FyYD62wl44cL15T8zOHBfdAHN2lgnM1_ZvC2BnMUyeXoU-GTM-JNkqZ-whXiYcKCjAVrgDIxVNKa1LWlCS5aQmJIEFWE7S1x2taVWQqizrPNttCXyFrnmaxUe8UNMsyxOwZu763wG2b37AdIc

Steps to reproduce the behavior:

1. Choose the "state" sample diagram.
2. Observe the expected diagram on the right
3. Add a config with the elk layout type
4. The diagram disappears.

Expected behavior
A diagram laid out with the elk layout algorithm.

Screenshots
The expected sample state diagram:

No diagram generated if the elk layout option is chosen - no error listed:

Desktop (please complete the following information):

• OS: macOS, version Sonoma 14.6.1
• Browser: Safari, version 17.6

Additional context
This was working fine about a week ago, it produced this with the following config:

---
 config:
   layout: elk
   elk:
     mergeEdges: false
     nodePlacementStrategy: NETWORK_SIMPLEX
---