Cracked my coil pack trying to unthread bolt

[TaysonGS]

Went to check gaps on all of my spark plugs and while trying to loosen the bolt that holds one of the coil packs in , the plastic completely broke off where the bolt holds down the coil pack. That bolt was on TIGHT. I'm wondering if I need to replace the coil pack asap or if it will be fine. I made sure the coil pack was still held firmly in place. I Turned on the car and revved it a few times, no CEL or misfires. How big of an issue is this?

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[ice445]

I'd replace it for peace of mind, but I don't think it's an emergency thing if the car is working okay.