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Hello,
We are encountering another error when using Deferred Layout Updates with a dynamic data set. A previous bug fix allowed us to use deferred settings with dynamic data, but now we are finding if a filter is applied to an item in the rows axis and there is something in the values axis, the field list control shows the spinner but locks up and an error is thrown in the console (regarding the aggregateType property being undefined).
Reproduced here:
https://stackblitz.com/edit/angular-k3g1iy-yckhsp?file=app.component.ts
Reproduction steps:

Please let me know if there are any questions.
Thanks,
Michael