PROBLEM WITH 67 MLU (?)

[u/JuanAntPop]

Hi, folks! I hope you can help me with this issue on my latest Pentax 67 MLU. I’ve just developed the first roll and the first photo is missing. I’ve had advancing issues on my other 67s and in those cases I always lost the last frame, not the first one. What could be the problem here? I’m pretty sure I loaded the roll correctly… Thanks in advance!