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Plugs keep on throwing error

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In Feb when the gearbox was replaced, BMW also replaced the spark plugs due to a slight misfire when idling (cold and hot).

Misfire was gone for a while and came back about two weeks ago to the point where there is a slight hesitation when accelerating mildly. When the car is started from cold and left idling it will idle at a higher rev for a while and then shake a bit and drop immediately to normal revs. This is when the misfire is most pronounced. When normal operating temp is reached and I idle for a while in traffic or robot the misfire while appear. It seems as if it is on one cylinder as the time between misfire seems constant.

Car went in yesterday and after two days of diagnosis, plugs were again identified as the problem.

I was not happy with this result and the technician insists that the plugs came up as the issue in their diagnosis. Raised the issue with the Workshop manager and after seeing the claim for plugs in Feb told the technies to re-diagnose.

So my question is, can something else be causing the plugs to throw an error or possibly damage the plugs? Are the coilpacks perhaps the culprits? Injectors?

Getting a bit scared of the car as in addition to the idling issue, diff is being replaced, new door locks and one rear brake disc was cracked.

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