Monza 1971 pitlane bug

Hello, I have found a Monza 1971 version somewhere in my files and tested it. Unfortunately it is not possible to enter the pitlane as a human player, the car just warps to the left at the pit entry and you have to go on for another lap until fuel runs out. The AI cars can enter the pitlane properly. Does anyone already know from this bug? I can upload the files to mediafire tomorrow if you want to, I think it's the Monza 1971 beta version made by Atticus (?).