New Label Edit (arrow left/right to insert) GUI freezing in 2.3.1

Running 2.3.1. Half-way through tech today, had the new Label Editing (arrow left/right) act up. The feature was still working but the GUI was no longer reflecting where I was in the Label. The underscore just kept blinking at the end of the label but I could arrow left and type and new text would be inserted. But I couldn't tell where I was in the Label. Any one else run into this?

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