Selling Gives Free Unit Bug

I have yet to confirm the circumstances of this bug: [NAREFN] FreeUnit=HARV DeploysInto=HARV UndeploysInto=CMIN (Forgive me, the above flags may not be exactly how I had them set up to cause the following effect, they need confirming.)

Sell the Refinery, a HARV appears. Didn't test undeploy.

If this effect were replicatable without side-effects, then one could use it on the Mobile War Factory (rally-point instead of undeploy, sell to undeploy with soylent=0).