Parallel Index Only Scan using positioner_moves_p7_2025_pos_id_pos_move_index_idx is where it went wrong, but the rows returned look fine indicating to me that it's not a planner problem. I would start by checking for locks. Also, positioner_moves_p5_2025_pos_id_idx is redundant with positioner_moves_p5_2025_idx and positioner_moves_p5_2025_pos_id_pos_move_index_idx.