Yes, unfortunately, you will miss out on deducting the rest of the Mortgage Insurance Premiums if you refinanced before the 84th month. My post below has more details or you can check out this section of IRS Publication 936: Claiming Your Deductible Mortgage Insurance Premiums.
Keep in mind if points had been involved with refinancing, the remaining point balance not yet deducted would have been deductible in the year the loan was paid off. In such a scenario, the life of the mortgage is used, not 84 months.
See Deducting Mortgage Interest FAQs and scroll down to What if I refinanced? to learn more.
@mh0520
[Edited 01/23/2021 | 3:49 PM PST]
