Weird TLSPolicyFailure errors with self signed certificates

We use self signed CA for securing our FDB traffic in staging but not in production we have those weird error messages

teTime
2025-08-15T23:04:39Z
ID
0000000000000000
Machine
10.241.1.88:4502
Reason
preverification failed
Roles
SS
Severity
20
Type
TLSPolicyFailure
VerifyError
self signed certificate in certificate chain
__InvalidSuppression__

But from what I can tell it seems that everything is working how can it happen ?

Did you set tls-ca-file with the correct certificates?