The 1099 won't be received till next year but will report it to 2018. since Roth is taxable income, wait till next year, you will be taxed only on the gains.
You will receive a Form 1099-R with Code "8" in Box 7 for the earnings or losses in the year excess was withdrawn. If you withdrew the excess in 2019, this will go on your 2019 Tax Return. you only report the overcontribution as income this year 2018.
Yes your 401k overcontribution appears to be a loss. The excess deferral $4,163 is taxable in the year deferred. The loss is deductible in the year received. You will get a net check but you will claim income for the full amount this year, will receive a Form 1099-R for the full amount with code P next year. Next year you will report the loss and it will be in other income with "Loss on Excess 401k Deferral Distribution"
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