Unable to use vault, credential store, or elytron expression resolver in RH-SSO truststore spi

Issue

• Replacing the truststore password in <spi name="truststore"> with encrypted value using password vault or credential store results in following error:

FATAL [org.keycloak.services] (ServerService Thread Pool -- 65) Error during startup: java.lang.RuntimeException: Failed to initialize TruststoreProviderFactory: /java-11-openjdk-11.0.6.10-0.static.jdk.openjdkportable.x86_64/lib/security/cacerts
    at org.keycloak.keycloak-services@15.0.6.redhat-00001//org.keycloak.truststore.FileTruststoreProviderFactory.init(FileTruststoreProviderFactory.java:84)
    at org.keycloak.keycloak-services@15.0.6.redhat-00001//org.keycloak.services.DefaultKeycloakSessionFactory.loadFactories(DefaultKeycloakSessionFactory.java:297)
    at org.keycloak.keycloak-services@15.0.6.redhat-00001//org.keycloak.services.DefaultKeycloakSessionFactory.init(DefaultKeycloakSessionFactory.java:106)
    ...
Caused by: java.io.IOException: Keystore was tampered with, or password was incorrect
    at java.base/sun.security.provider.JavaKeyStore.engineLoad(JavaKeyStore.java:792)
    at java.base/sun.security.util.KeyStoreDelegator.engineLoad(KeyStoreDelegator.java:243)
    at java.base/java.security.KeyStore.load(KeyStore.java:1479)
    at org.keycloak.keycloak-services@15.0.6.redhat-00001//org.keycloak.truststore.FileTruststoreProviderFactory.loadStore(FileTruststoreProviderFactory.java:107)
    at org.keycloak.keycloak-services@15.0.6.redhat-00001//org.keycloak.truststore.FileTruststoreProviderFactory.init(FileTruststoreProviderFactory.java:82)
    ... 42 more
Caused by: java.security.UnrecoverableKeyException: Password verification failed
    at java.base/sun.security.provider.JavaKeyStore.engineLoad(JavaKeyStore.java:790)
    ... 46 more

• If the password is entered in plain text in the standalone.xml, then the truststore can be opened and the server instance starts.