There is a gap, and it sits in two places.
First, appraisal support. The refinance rests entirely on an appraised value the operator doesn't control, and most operators hand the appraiser a key and hope. What helps is a packet: scope of work with dated photos of the before condition, permit numbers where permits were pulled, a comp set the operator has already vetted, and a rent survey if the lender's product uses market rent. An appraiser is not obliged to use any of it and many won't lean on it much, but a missing comp that supports value is worse than a rejected one. Reconsideration of value processes exist at most lenders and they are narrow, usually requiring closed sales the appraiser omitted rather than an argument about quality.
Second, the underwriting box itself. The LTV cap stops being the limiting number once debt coverage bites first. Say all-in is $150k, appraisal comes in at $200k, the lender's cap is 75%, so $150k of loan looks available. If the product also wants 1.20x coverage and rent is $1,600 with $400 a month in taxes, insurance and management, the supportable payment is around $1,000, and at the rates in this environment that payment does not carry $150k. The loan sizes to the coverage test and the operator leaves capital in the deal. Anyone who could tell an operator which of those two tests will bind before they buy would be worth paying.
The thing that eats operators is overlay drift. A lender's seasoning rule, appraisal panel, or coverage minimum can change between the quote and the closing, and the quote is not a commitment. Get the terms in writing and re-confirm before the rehab is done.