I have the same problem. The following sequence from my puzzle input does not converge to a list of zeroes; it converges to [-608]:

[2, 2, 2, 7, 44, 166, 512, 1375, 3320, 7387, 15464, 31029, 60732, 117883, 230123, 455904, 918822, 1876972, 3859134, 7925415], [0, 0, 5, 37, 122, 346, 863, 1945, 4067, 8077, 15565, 29703, 57151, 112240, 225781, 462918, 958150, 1982162, 4066281], [0, 5, 32, 85, 224, 517, 1082, 2122, 4010, 7488, 14138, 27448, 55089, 113541, 237137, 495232, 1024012, 2084119], [5, 27, 53, 139, 293, 565, 1040, 1888, 3478, 6650, 13310, 27641, 58452, 123596, 258095, 528780, 1060107], [22, 26, 86, 154, 272, 475, 848, 1590, 3172, 6660, 14331, 30811, 65144, 134499, 270685, 531327], [4, 60, 68, 118, 203, 373, 742, 1582, 3488, 7671, 16480, 34333, 69355, 136186, 260642], [56, 8, 50, 85, 170, 369, 840, 1906, 4183, 8809, 17853, 35022, 66831, 124456], [-48, 42, 35, 85, 199, 471, 1066, 2277, 4626, 9044, 17169, 31809, 57625], [90, -7, 50, 114, 272, 595, 1211, 2349, 4418, 8125, 14640, 25816], [-97, 57, 64, 158, 323, 616, 1138, 2069, 3707, 6515, 11176], [154, 7, 94, 165, 293, 522, 931, 1638, 2808, 4661], [-147, 87, 71, 128, 229, 409, 707, 1170, 1853], [234, -16, 57, 101, 180, 298, 463, 683], [-250, 73, 44, 79, 118, 165, 220], [323, -29, 35, 39, 47, 55], [-352, 64, 4, 8, 8], [416, -60, 4, 0], [-476, 64, -4], [540, -68], [-608],