This is a well known (long standing) issue. Documented in the code base in commit eea02be70ee37b845f2719b3c08e5baf4b6f51f6.

Countless intermittent sanitizer warnings can be attributed to it.
if (interruptNet) {
            return;
        }
        LogPrintf("Loading addresses from DNS seed %s\n", seed);
        if (HaveNameProxy()) {
            AddOneShot(seed);
        } else {
            std::vector<CNetAddr> vIPs;
            std::vector<CAddress> vAdd;
            ServiceFlags requiredServiceBits = GetDesirableServiceFlags(NODE_NONE);
            std::string host = strprintf("x%x.%s", requiredServiceBits, seed);
            CNetAddr resolveSource;
            if (!resolveSource.SetInternal(host)) {
                continue;
            }
            unsigned int nMaxIPs = 256; 
            if (LookupHost(host, vIPs, nMaxIPs, true)) {
                for (const CNetAddr& ip : vIPs) {
                    int nOneDay = 24*3600;
                    CAddress addr = CAddress(CService(ip, Params().GetDefaultPort()), requiredServiceBits);
                    addr.nTime = GetTime() - 3*nOneDay - rng.randrange(4*nOneDay); 
                    vAdd.push_back(addr);
                    found++;
                }
                addrman.Add(vAdd, resolveSource);
            } else {
                
                
                AddOneShot(seed);
            }