certvalidator accept a certificate with version 1 and extension fields

I have a certificate chain [rootCA,intermediate certificate,leaf certificate], which leaf certificate has extension fields and its version is 1. Clearly, leaf certificate violate Section 4.1.2.1, RFC5280: “When extensions are used, as expected in this profile, version MUST be 3 (value is 2). ”. Meanwhile, the chain can still pass certificate verification with certvalidator0.12.0.dev1 version.

To Reproduce：

import sys
from certvalidator import CertificateValidator, ValidationContext
def main():
    if len(sys.argv) < 3:
        sys.exit(1)      
    ca_path = sys.argv[1]    
    seed_path = sys.argv[2]  
    with open(ca_path, "rb") as f:
        ca_bytes = f.read()       
    with open(seed_path, "rb") as f:
        seed_bytes = f.read()
    context = ValidationContext(
        trust_roots=[ca_bytes],
        allow_fetching=False,
        crls=[],
        ocsps=[]
    )
    validator = CertificateValidator(seed_bytes, validation_context=context)
    validator.validate_usage(key_usage=set())
    print("ok！")
if __name__ == "__main__":
    main()

python3 verify.py ca.pem seed.pem

Expected behavior：
According to RFC 5280, it should be rejected.

test.zip

Run the verify.py reproduction with ca.pem and seed.pem from test.zip, focusing on CertificateValidator and ValidationContext. Trace how the leaf certificate's version and extension fields are checked, then verify that the invalid chain is rejected while valid certificate chains continue to pass.