Large tag subscription fails to update

I have a 1000 tag license for the WebIQ runtime on ctrlX OS. I am able to deploy my 1000 tag project to the runtime, but OPC UA subscription updates are only firing for the first 500 tags.

I am subscribing to the items in a local-script and checking for their updates in a boolean array. As you can see below, indices 0-499 update from the subscription, but 500-999 never update. Any idea what is happening here?

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