BMP280 IIR Filter option is ignored

Operating environment/Installation (Hass.io/Docker/pip/etc.):

Manjaro 20.2
no docker (esphome run in shell)
Python 3.9
pip 20.2.1

ESP (ESP32/ESP8266, Board/Sonoff):

LoLin NodeMCU V3 ESP8266

ESPHome version (latest production, beta, dev branch)

ESPHome 1.15.3 (installed from AUR)

Affected component:

https://esphome.io/components/sensor/bmp280.html

Description of problem: The IIR Filter option is ignored.

Problem-relevant YAML-configuration entries:

sensor:
  - platform: bmp280
    i2c_id: bus_a
    address: 0x76
    iir_filter: 16X
    temperature:
      name: "BME280 Temperature"
      id: "temp"
      oversampling: 8X
    pressure:
      name: "BMP280 Pressure"
      id: "pressure"
      oversampling: 8X
    update_interval: 10s

Logs (if applicable):

[13:51:46][C][bmp280.sensor:098]: BMP280:
[13:51:46][C][bmp280.sensor:099]:   Address: 0x76
[13:51:46][C][bmp280.sensor:111]:   IIR Filter: OFF
[13:51:46][C][bmp280.sensor:112]:   Update Interval: 10.0s
[13:51:46][C][bmp280.sensor:114]:   Temperature 'BME280 Temperature'
[13:51:46][C][bmp280.sensor:114]:     Unit of Measurement: '°C'
[13:51:46][C][bmp280.sensor:114]:     Accuracy Decimals: 1
[13:51:46][C][bmp280.sensor:114]:     Icon: 'mdi:thermometer'
[13:51:46][C][bmp280.sensor:115]:     Oversampling: 8x
[13:51:46][C][bmp280.sensor:116]:   Pressure 'BMP280 Pressure'
[13:51:46][C][bmp280.sensor:116]:     Unit of Measurement: 'hPa'
[13:51:46][C][bmp280.sensor:116]:     Accuracy Decimals: 1
[13:51:46][C][bmp280.sensor:116]:     Icon: 'mdi:gauge'
[13:51:46][C][bmp280.sensor:117]:     Oversampling: 8x

Additional information and things you've tried: I've tried to change values both at IIR and oversampling. The oversampling works fine, but the IIR stays off (even tried with capital X). I've browsed the python and C++ code hoping to find the problem without luck.

esphome / issues

BMP280 IIR Filter option is ignored #1695