Suddenly dataflow refresh error SqlDateTime overflow

After further tests, I assume the problem seems to be that there is some kind of query folding.

The problematic query doesn't contains any datetime statements. Just renaming of column names and changing the column type.

But the MS NAV 13 ODATA query contains a filter on the posting date. Posting_Date=FILTER(01.01.18..)

The filter works just fine in NAV and gives me the filtered table. Also in PBI Desktop I get the result.

Just PBI dataflow has an issue - and only with the beginning of this week.

1. How are we supposed to use dataflows, if the behavior changes without beeing informed of changes under the hood?

2. Why are the current bugs not solved?
a) A german user has to change the locale in dataflow to english, for it to work properly.
b) There is the date / datetime issue. Every time a column type is changed to just date and the entity is linked to another dataflow or loaded into PBI desktop the column type is datetime again...

Please solve these minor issues.

KR
Alex