I am thinking it might be because many of the warrant holders fit the definition of insiders and they would be possibly then making trades by receiving extra warrants with inside information.
If they start issuing extra warrants to extend the deadline on the existing, it could be regarded as inside information to these warrant holders. As the company is unblinded already, they move money from existing shareholders (by dilution) to existing warrant holders (issuing extra warrants). Wouldn’t this be highly questionable?