If you don't sell the 110 shares released, it is not a tax event.
You treat 200 shs as regular income (W-2). The proceeds of selling 90 shares as the withholding amount.
You log a stock transaction on Schedule D (new 8949 form) as buy and sale 90 shares at the same price - 0 profit/loss. Because it is 0 impact, you may not record it, but in theory you should.
Not recording it may trigger an audit event because IRS will surely check the total stock transaction proceeds it received from all your brokerage accounts against what you report. Again, there will be no impact even if you are auditied, because you owe nothing.
However, triggering an audit is not something you want to get into...