In Reporting Services, we can specify the transparency for each map layer independently. Default values for transparency differ depending on how you add a layer. A transparency of 0% means the layer is opaque and no other layer data will show through this
one. To allow other data to show through an existing layer, adjust the value to a higher percentage. In this issue, the issue may occur if the transparency value for any layer that covers the existing layer is 0. So, please check the outer map layers and ensure
the transparency values are not set to 0.
Hope this helps.
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