That issue is quite well known, and it's affected Victorion, G2 Bruticus and TFCC Thunder Mayhem.
The actual problem in the triangular piece of the knee strut facing the wrong direction, causing it to press into the shin if you try to lock in the knees for regular robot mode. That's the only mode in which it's problematic, vehicle and combined mode have no such issue. Avoiding the problem is easy: fully extend the knees past the lower leg. That has the added advantage of making Pyra Magna that more unique compared to Hot Spot and Onslaught.
Actually fixing it can be done, but it requires a sacrifice, a steady hand and lots of caution. All you need is a Phillips screwdriver and a hobby knife. Here's a guide on how to do it:Pyra Magna knee fix
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