Looks like one of the backdoor authors even went and disabled the feature the exploit relied on directly on oss-fuzz to prevent accidental discovery: https://social.treehouse.systems/@Aissen/112180302735030319
https://github.com/google/oss-fuzz/pull/10667
But luckily there was some serendipity: "I accidentally found a security issue while benchmarking postgres changes." https://mastodon.social/@AndresFreundTec/112180083704606941