I converted the lower layer design to qxp and connected it to the upper layer. When I checked the RTL Viewer after compiling, all output ports of the qxp design were displayed as GND output. Is there not a problem?

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I qxp the design of the lower hierarchy and connected it with the upper hierarchy. When I checked with the RTL Viewer after compiling, all the output ports of the qxp design were displayed as GND output. Is there not a problem?

When I check the qxp module with RTL Viewer, the output port is GND output.
However, when I check the same qxp module with Thechnology Map Viewer, it is not GND output, so it is connected without problems.

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