Bug: ESP8266-01 toggles GPIO level at boot

[ChrisO]

Hi

I bought few ESP-01 Relay boards with a ESP8266-01 sitting on them.
The relay is triggered by the GPIO0 pin. The level of GPIO0 defined (given by HW design) to be HIGH.
However, during boot/startup before the pin goes HIGH for a very short time it goes DOWN, 0V. Short but long enough to trigger the relay.
This makes this combo useless for serious use like controlling a garage door.
This is IMHO a bug in the firmware.
Is it a known problem?

Thanks
ChrisO