Carlos Sainz caused the second red flag in Imola. The Ferrari driver went off track during Q2 and ended up in the wall.
Sainz was working on a fast lap, which seemed to put him below Verstappen's provisional fastest time. However, his attempt literally and figuratively fell apart when he lost control of his F1-75 and ended up in the wall.
This was followed by a red flag, giving the rain plenty of time to fall from the sky and putting a damper on any attempts to improve times. So it looks like Q2 will end with the current standings.