Tasmota v16.0.0 ships a fix worth applying and a stricter upgrade path
The first v16 major of the ESP8266/ESP32 firmware fixes unauthenticated UFS writes on password-protected web interfaces, removes direct migration from versions before v8.1.0, and adds ESP32-S31, C61 and P4R3 support, optional MQTT 5.0, Matter 1.6.1 and expanded DALI-2.