I am working on a sheet metal part which has several configurations, each of which needs a different thickness.

If I make the first configuration using base/flange, check "override default",  and edit the thickness, the dimension for thickness appears when I click on sheet metal. I then edit that dimension (D7@sheet-metal1) to equal a global variable. If I edit that global variable the dimension in the sheet metal feature updates, but the thickness does not.

If I make the first configuration using convert to sheet metal and follow the same process, the thickness DOES update. Now if I go and make a new configuration this stops working. For some reason, in the new configuration, it kicks D7@sheet-metal1 out of my equations and creates a global variable called D7 with the last used value in D7@sheet-metal1.  If I try fixing it by deleting the new D7 global variable, editing sheet metal again, and relink D7@sheet-metal1 to my original global variable, I can get the new configuration working like the original, but I get the same error going back to the original configuration. I also tried linking the thickness of the original extruded part to the global variable I'm trying to control the sheet metal with, but that doesn't seem to effect anything.  I've been fighting this for a few hours and I'm running out of ideas.

TLDR; how do I get the linked "thickness" variable generated by "convert to sheet metal" to update for different configurations?