Tromboncino squash - Split stem - Shall I remove it?

I planted a few Tromboncino in the front bed, and other four in the back, because last year they were a massive success with my wife.
They are doing well, but one stem split.
It is actually a pretty weird thing, at first I thought it was some pest munching through it, but they are very resilient to slugs and similar, I cannot see any other damage and no other plants around are affected, so perhaps not.
Sorry, I did not take a photo, but I will post one tomorrow.

The thing is, the plant is doing quite well anywyay, it would seem.
But they are very large when they grow, 10 feet or more at times, and the squashes are quite massive. So I am worried that it will not do well in the long run.
I am tempted to simply cover the stem with soil and let it be.

Any opinion?
Does anyone know why this might happen?
Again, perhaps my description is a bit too generic, I will post a photo tomorrow.

Thanks,
Aldo

 

Well, here are a few photos showing the stem itself, the plant and another tromboncino to compare.
They seem to be doing equally well, so perhaps I should just bury the split secton in soil rather digging out the plant and putting something else in?