the coach re-designated the libero with the correct number.
So in essence this match was lost due to a typo - like we did not know who the libero was because the number was not matching. What I really don't like about this rule is the potential for a scorekeeper or libero tracker to make a typo or miss a sub and cause a huge problem.
So, not that it was not important, but now the most important part of the match is to check the lineup and make sure the libero numbers are correct because this can have an enormous impact on the match, way more than any call you make......