It sounds like the buyer came to the closing table and changed his mind. Objections to commitment for title insurance are limited to the period shown 6D.
Normally, the lender does not care if easements appear. You should ask the buyer to provide the lender's objection in writing. The limitation on backing out due to non-approval of the borrower/buyer is in the Third Party Addendum. The limitation on backing out under 4A is the closing itself. So, if the lender actually did not approve the property to be used as collateral for the mortgage loan, that appears to satisfy 4A as a valid reason for termination.
Only a judge and jury can make the determination, and you should be seeking legal counsel from someone practicing in real estate to assist and advise on the matter of approvability of the property for use as loan collateral. We, Realtors, cannot advise you.
Your attorney can tell you whether loss of earnest money is in order or if you need to back off.
Listing agent, real estate attorney, title company you need to discuss all conditions of contract, any answer provided is based on what is stated in your comment.