Application Studio: Error on Update Event-Next Widget After Updating Order Line and Saving

We are working on a layer in Application Studio for Order Entry and encountered the following issue:
First a line is added or updated on an order and then save is clicked. Then when attempting to use the row-update and event-next (update) widget we receive an error: OrderDtl not found. If we don’t click save before triggering the event then it works normally.

This is replicable and we created a simple example that illustrates the issue.
Here is our test button click event that does a very simple update to just the OrderHed.PONum field:


We then get the error: OrderDtl not found.

We are on Kinetic version 2021.2.7

Has anyone else encountered this issue?