Server name parameterization causes refresh issues

Hi, last Power BI desktop update introduced parameters. I changed hard coded Server name in pbix and replaced it with parameter SERVER_NAME. After this change refreshes through Enterprise Gateway took unusually long time and finally resulted in error for unknown reason. Took me 2 days to resolve this (did other changes as well) Server name as a parameter is a must for moving from dev to production. Please fix this problem Thanks Jiri