CLI - modify-data-source does not work

This operation used to work in Alpha1 but does not work anymore:

[standalone@localhost:9999 /] add-data-source --jndi-name=java:jboss/datasources/TestDS --driver-name=h2 --pool-name=TestDS --connection-url=jdbc:h2:mem:test;DB_CLOSE_DELAY=-1
[standalone@localhost:9999 /] modify-data-source --jndi-name=java:jboss/datasources/TestDS --idle-timeout-minutes=5

The result is:
{"Composite operation failed and was rolled back. Steps that failed:" => {"Operation step-1" => "Invalid parameter name: value"}}

Error logged:
12:46:07,903 ERROR [org.jboss.as.controller] (pool-3-thread-3) Operation ("write-attribute") failed - address: ([
("subsystem" => "datasources"),
("data-source" => "java:jboss/datasources/TestDS")
]) - failure description: "Invalid parameter name: value"