OK, the real fix is: Do not use Turbo or use Brain 1.0 to inspect Opera seeting for Turbo and sweitch off if enabled.
@dirgas In this case you request a browser 'fallback'
Yes, you may call it fallback. I call it failsafe 😉
Local IPs are wellknown by IANA. See https://tools.ietf.org/html/rfc1918
A internal lookup table should be in Opera Stable, to disable Turbo for private IPs.