Bug - "transaction precondition not met in member character" when removing block

Hi, this is really impressive project, well done. I have however encountered a bug when removing blocks. Here's a minimal reproducible example: - run `cargo run --bin all-is-cubes` - (demo-city scene loads) - remove blocks at following coordinates using LMB - `-7, 0, -15` (ground) - `-7, 0, -17` (ground) - `-7, 1, -17` (grass) - `-7, 1, -15` (grass) - when removing the last block (`-7, 1, -15`), following error will appear and block wont be removed: > Error applying tool: unexpected error: transaction precondition not met in member 'character' I hope it reproduces even on your side. If not, let me know what other details I can provide.