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Ah, that explains why it lasts exactly one generation longer than the r-pentomino
Thanks!

Hey everyone, I stumbled across a 5-cell pattern in a 3x3 bounding box that lasts 1104 generations, so 1 generation longer than the r-pentomino.
I would be surprised if no one found it yet, since it is so small, but I'm still putting this here since I could not find it anywhere:
x0x
xx0
x00
Does ...

Does anybody know where to find a list with the longest-lived methuselah possible in a particular bounding box (4x4, 16x16 or so)? thx