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What worked for me was to move the BearSSL declaration and usage after the pinMode setting of the GPIO.

I had to make the certificate and keys local variables and wrap the entire setting up of WiFi, connecting to it, setting up and connecting to the AWS core in a single function after setting up the GPIO pins.

void setupWiFiAndConnectAWS() {
  BearSSL::X509List cert(AWS_CERT_CA);
  BearSSL::X509List client_crt(AWS_CERT_CRT);
  BearSSL::PrivateKey key(AWS_CERT_KEY);
  WiFi.persistent(false);
  DEBUG_MSG("[setupWiFi] Setting host name\n");
  WiFi.hostname(deviceId);
  DEBUG_MSG("[setupWiFi] Setting station mode\n");
  WiFi.mode(WIFI_STA);

  if (WiFi.getMode() & WIFI_AP) {
    WiFi.softAPdisconnect(true);
  }

  WiFi.persistent(false);
  DEBUG_MSG("[setupWiFi] Loading certificates\n");
  net.setTrustAnchors(&cert);
  net.setClientRSACert(&client_crt, &key);
  loadCredentials();
  connectWiFi();
  attachInputInterrupts(false);
  setupNTP();
  connectAWS();
}

Although this is a workaround, I still don't understand the core problem and would like to understand it.