Empty cycle point - getFamilyTree() TypeError

[MetRonnie]

Description

I had a workflow open with the tree view. I uninstalled, reinstalled, and started it.

Uncaught TypeError: Cannot read properties of undefined (reading 'slice')

Location:

cylc-ui/src/store/workflows.module.js

Line 322 in b0204f2

for (const ancestor of node.ancestors.slice().reverse()) {

node has no property ancestors.

It caused a cycle point to show up as empty, similar to in #1813

[oliver-sanders]

Hmm, does this mean that GraphQL did not return the ancestors field on a task?

Try jamming in some console.logs to find out.