Deploy BuildMaster Build To Stage doesn't seem to be passing variables. 

I hadn't used this functionality before for this function but have some new jobs I was trying to use it with.

These are being entered via Classic view so entered into the Variables field. I've tried the following formats:

varname=$Client_Id

varname=${Client_id}

varname=${ENV,var="Client_Id"}

The create build step works fine with the second format. 

If this is a bug would there be a chance you could provide a fix compatible with 6.1.26 as I have a legacy extension in BuildMaster that I will not be able to replace for a couple of months.