Worst On-Set LUT Management Mistake & Impact on Post

The most critical mistake I’ve seen regarding LUT management on set is simply having the wrong LUT loaded (or no LUT at all) on critical monitoring paths, which profoundly misled aesthetic decisions for an entire shooting day and caused significant re-grading in post. I once worked on a commercial where the DIT accidentally had a 'Rec.709-light' LUT engaged instead of the intended 'Rec.709-heavy' look specific to our show, which had been approved by the agency. We were shooting on an ALEXA Mini, and everything in Video Village (fed from a Teradek Bolt 4K LT) looked beautifully contrasty and vibrant to the director and client. The DP, seeing a flatter image on his on-camera monitor calibrated for LogC, tried to compromise, leading to subtly over-lit scenes to compensate for what looked like a 'dark' image to him, not realizing the discrepancy in the village display. The creative team thought we were nailing the look. Post-production got the LogC files and applied the correct heavy LUT, revealing an unacceptably crushed image with blown-out highlights and muddy shadows from the over-lighting. We had to spend three extra days in grading trying to recover detail, incurring significant additional costs and delaying delivery by a week. It was a stark reminder of the importance of meticulous LUT validation, as emphasized in resources like "The Complete Guide to On-Set Monitoring and Video Village Setup" (https://blockreeldao.com/blog/the-complete-guide-to-on-set-monitoring-and-video-village-setup). What steps do others take to double-check their LUTs across all monitors, especially when working with external clients?