Today I was in a run to 8-3 where I could've easily gotten a sub 5. This run was -0.3 (3:36.2 8-2 split) with bad judges and slow pipejump in 8-2. I had nerves and did my usual 8-3 route (kill first koopa, top, and jump over all), but I was killed by a hard hammer thrown by the third hammer bro which normally isn't there. This has happened before, but I figured I either split inaccurately or started my timer at -3.62 rather than -3.27.

The video below is a comparison of me trying to replicate what happened in savestates. The left had the same issue while the right successfully made it through with the only differences being a few added jumps and some jumps that were delayed by a few frames.

These were both from the same savestate (-3.27, bad judges, slow pipejump) and were both played on consecutive attempts.

I don't know much about this kinda stuff, but the direction that the first bottom bro throws his hammer is different between the two videos (I'm guessing because you killed him at slightly different times). I generally try to avoid killing bros if I do not have to because I have noticed similar inconsistencies in the past.