The Football Association has said the record eight-minute VAR stoppage during Bournemouth's FA Cup fifth-round win against Wolves was caused by a congested penalty area.
It came during the first weekend of the semi-automated offside system being trialled in English football, which is supposed to reduce the decision time by 30 seconds in close offside calls.
The officials were unable to rely on that technology during the check, and needed to revert to manually drawn lines before disallowing Bournemouth defender Milos Kerkez's 35th-minute goal.
Fellow defender Dean Huijsen was adjudged to have been in an offside position as Kerkez's effort brushed his shoulder.