I personally have 2x broken Manix blades. M390 and Maxamet..
Both from end of blade, up through the Spydie hole..
To be fair.. I had the wrong tool for the job, with the M390..
Stripping kinling off a log and using a 1" branch, to baton the back of the Manix blade.
Have used other Spyderco's, in other steel's, to do the same.. No issues.
The Maxamet was 2nd hand a came with a sharpening choil. The little twist of cutting a ½" branch, was too much for it and snapped.
Threw a couple pennies in the trash, with those 2..