Hello @scott.tomlinson - This has now been resolved for Revit 2023.1 and Dynamo 2.15, and will also be hot-fixed back to Revit 2023.0.1 along with a bunch of other bug fixes in Revit.
Unfortunately I cannot gives dates on this, but the hotfix should be coming out relatively soon 
So sorry for the frustration on this one.
As rightly noted, it鈥檚 a generic problem that had to be remedied inside the Unit Converter class: fix the issue revit-191624 (#2826) by wangyangshi 路 Pull Request #2846 路 DynamoDS/DynamoRevit 路 GitHub