No you are mistaken this is a known problem with memento. It is also true that poor quality burns will cause this problem but that is not the issue here.
It has been theorized that ether the read speed gets locked into a speed too slow to read the load heavy video or that the memento code uses up too much RAM. I don’t know which one is true if ether but its probably the first one.
I have not understood so it is possible to start patched discs on ps2 without the chip?