I'm unsure how this happened but I thought it was worth posting anyway. The turret continued to work as normal so I'm guessing this is just a visual bug.
The bug took place in the matchmade GM Onslaught: Midtown activity.
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Hi there, Thank you for your report and the linked screenshot. We understand friendly turrets were affected by the Rage modifier in Onslaught. We can imagine how this may have impacted your experience of the activity. At this time, we have taken note of your report of this incident.