Fuzz coverage failures https://dev.azure.com/cncf/envoy/_build/results?buildId=51617&view=logs&j=029e00ef-277c-5f07-2730-d196f67f2820&t=2c49709e-9753-555d-932c-01a1e7393229

happen from crashing on fuzzed entries. Before, crashes would not be added to the corpus and tested.