Builder contributions are capped like any other interested-party contribution
“Interested party contributions are limited to 3% of the value for LTV ratios greater than 90%, 6% for 75.01%–90%, and 9% for 75% or less on a principal residence.”
A builder cannot credit you unlimited closing costs. Anything above the cap must be treated as a sales price reduction, which changes your loan amount and can change your approval.