Chrome Selenium IDE 3.4.5 extension "execute script" command not storing as variable

I am trying to create a random number generator:

Command | Tgt | Val |

store | tom | tester

store | dominic | envr

execute script | Math.floor(Math.random()*11111); | number

type | id=XXX | ${tester}.${dominic}.${number}

Expected result:

tom.dominic.0   <-- random number

Instead I get this:

tom.dominic.${number}

I looked thru all the resources and it seems the recent selenium update/version has changed the approach and I cannot find a solution.