[mbed-tls] What am I doing wrong?

https://gist.github.com/FGasper/43758d13e987518009d18ec8951ffcbb

^^ With 3.0.0 this prints:

seeded entropy mbedtls connected trust loaded ok SNI set ok handshake tried handshake: X509 - Certificate verification failed, e.g. CRL, CA or signature check failed

… but if I switch to the development branch, it works.

Same trust chain, same code … but the production code fails while the dev one works …

Am I just “holding it wrong”?

Thank you in advance!

-FG