Text values are consolidated to single case (either upper or lower)

I have noticed an issue with Slicer/filter cards and Table visual. The text values automatically converted to upper/lower case and consolidated into a single value. For Example, my table has 2 values SIVA and siva. The slicer/Table visuals either show SIVA or siva, it doesn't show both values. It leads to the wrong representation of the data/insights in some-case where I need both values.

In the Query Editor, I can see both values. However, it is not the case in the reporting layer.

I'm experiencing this behavior in both Power BI Desktop and the Service.