Yes, thats what I feel
I played 2 S/P, the first set following the instruction, it said break in around 80C, I think this temp is too cold for this engine during break in period. lost compression end up around 2L of fuel.

The second P/S, break in around 90C, the engine can run in proper temp, but the conrod worn out very fast, it's broken around 2L also.

Interesting thing is, the engine getting cold very fast during off throttle, this contrect and expansion actions make the compression go away (I think). I took the first p/s to run yesterday, it can go very fast in high rpm even no compression and low end power, the temp is still very cold around 80c something, I even used the 6c OS plug, it can't generate any heat.