Advent of Code 2020. I stuck on day 11‼️Part One

Question

My code:
https://code.sololearn.com/c4a25A10a24a/?ref=app
works correctly on an example input & outputs: 37‼️ but on puzzle input /too large for SL Playground/ makes a small mistake & outputs: 2107‼️, the correct output is: 2194.
This challenge is very similar to John Conway's "Game of Life", so I used the well-tested procedures from that code. I can't find error in algorithm logic. Any suggestions are welcome⁉️🤔
https://code.sololearn.com/cSRT2cW553AY/?ref=app

Answer 1

Victory ‼️😃 Already fixed‼️👍 Stupid bug‼️Wrong I assumed that the board is square⁉️😬