The provision of the incorrect image to broadcasters led to confusion over a VAR decision in Manchester United's FA Cup win at Huddersfield Town, says a company involved in the technology.
Juan Mata thought he had doubled United's advantage in Saturday's fifth-round tie at the John Smith's Stadium, only for the decision to be referred to the VAR system.
Misleading graphics showing seemingly wobbly grid lines were displayed by broadcasters in the immediate aftermath, with Mata's strike eventually correctly ruled out for offside as his kneecap was narrowly beyond the line of the last defender.