100% nan when using Ticker

[TinkerFu]

This is on an esp8266.

Went from polling sensor every 30 seconds via delay(30000) to using a Ticker. 100% failure.
I've even removed all wifi code down to just a ticker.

#include <DHT.h>
//#include <ESP8266WiFi.h>
//#include <ESP8266HTTPClient.h>
#include <Ticker.h>

#define DHTTYPE DHT22   // DHT 11
const int DHTPin = 2;

DHT dht(DHTPin, DHTTYPE);
Ticker sensor1;

void setup () {
 
  Serial.begin(115200);
  delay(10);
  sensor1.attach(30.0, getReadings);
}
 
void loop() {
}

void getReadings() {
      dht.begin();
      delay(50);
      float h = dht.readHumidity();
      float f = dht.readTemperature(true);

      if (isnan(h) || isnan(f)) {
        Serial.println("Failed to read from Sensor!");      
      }
      else{
        Serial.print("Humidity: ");
        Serial.print(h);
        Serial.print(" %\t Temperature: ");
        Serial.print(f);             
        Serial.println(" *F");
      }

}

I enabled debug:

    Max clock cycles: 80000
    Timeout waiting for start signal low pulse.

I've used this #48 as a reference but even after applying fix it still fails every time. Relevant section of my DHT.cpp

    // End the start signal by setting data line high for 40 microseconds.
    //digitalWrite(_pin, HIGH);
    //delayMicroseconds(40);

    // Now start reading the data line to get the value from the DHT sensor.
    pinMode(_pin, INPUT_PULLUP);
    delayMicroseconds(50);  // Delay a bit to let sensor pull data line low.

Same board works fine if the read code is put in main loop.

[PaintYourDragon]

Try newest library - reopen if still an issue.