If I got your question well you just need sequence of the gene. Is it possible to try another parser for this purpoe, i.e. SeqIO.parse(gb_file, "genbank") and then in a cycle for record in SeqIO.parse(gb_file, "genbank"): iterates through the records. Then use another cycle as follows:

from Bio import SeqIO
from Bio.SeqFeature import FeatureLocation


def extract_gene_name_seq(gb_file):
    gene_name_seq = []
    try:
        for record in SeqIO.parse(gb_file, "genbank"):
            # The SeqIO.parse() function takes two main arguments:
            # A file handle (or filename) to read the data from.
            # The format of the sequence file.
            # It returns an iterator that yields SeqRecord objects, one for each sequence in the file.
            for feature in record.features:
                if feature.type == "CDS":
                    try:
                        name = feature.qualifiers.get('gene', [''])[0]
                        location = feature.location
                        if isinstance(location, FeatureLocation):
                            start = location.start
                            end = location.end
                            gene_sequence = location.extract(record.seq)
                            strand = location.strand
                            gene_name_seq.append((name, strand, start, end, gene_sequence))
                        else:
                            print(f"Skipping feature with non-standard location: {feature}")
                    except (KeyError, AttributeError) as e:
                        print(f"Error processing feature: {feature}. Error: {e}")
                        continue

    except Exception as e:
        print(f"Error parsing GenBank file: {e}")
        return []

    return gene_name_seq

# Example usage:
gb_file = "Capsicum_annuum.gb"  # Replace with your GenBank file name
gene_name_seq_data = extract_gene_name_seq(gb_file)
print('Length of gene_name_seq_data', len(gene_name_seq_data))

if gene_name_seq_data:
    for name, strand, start, end, gene_sequence in gene_name_seq_data:
        print(f"Gene: {name}, Strand {strand}, Start {start}, End {end}, Gene_sequence: {gene_sequence}")
else:
    print("No gene information found or an error occurred.")