What was the controversy regarding pitch? Heard about it just now: Gill in press conference

On being asked whether the controversy surrounding the pitch change impacted India players in ODI World Cup 2023 semi-final against New Zealand, opener Shubman Gill said, "I just got to know from you that there was controversy regarding pitch." He added, "What was the controversy?" India beat New Zealand by 70 runs to reach their fourth ODI World Cup final.