Latest firmware as of today. I just installed my S4 system, and now one of my ESP8266 applications that has been running great cannot resolve the IP address for the nist ntp time server (can't post url in this forum). If I switch back to my old Wi-Fi network, it works fine.

Console:

LittleFS mounted successfully
Connecting to WiFi ......

Connected to Deco Mesh 5089
 

Time server IP: (IP unset)

Relevant code:

IPAddress timeServerIP; 

const char* ntpServerName = (nist server name, can't have url in this post)

WiFi.hostByName(ntpServerName, timeServerIP); // Get the IP address of the NTP server

Serial.print("Time server IP:\t");

Serial.println(timeServerIP);

sendNTPpacket(timeServerIP);