are the differences in power pins here familiar to anyone?

-------------------------------------------|-------------------------------------------
clk                                        |clk                                        
sc_en                                      |sc_en                                      
s0[0]                                      |s0[0]                                      
s0[2]                                      |s0[2]                                      
s0[1]                                      |s0[1]                                      
sc_data                                    |sc_data                                    
s1[0]                                      |s1[0]                                      
s1[1]                                      |s1[1]                                      
s1[2]                                      |s1[2]                                      
s0[3]                                      |s0[3]                                      
s1[3]                                      |s1[3]                                      
z0                                         |z0                                         
sc_data_out                                |sc_data_out                                
z1                                         |z1                                         
VGND_uq1                                   |VGND **Mismatch**                          
VPWR_uq2                                   |VPWR **Mismatch**                          
VGND                                       |(no matching pin)                          
VPWR                                       |(no matching pin)                          
VPWR_uq0                                   |(no matching pin)                          
VPWR_uq1                                   |(no matching pin)                          
VGND_uq0                                   |(no matching pin)                          
---------------------------------------------------------------------------------------

Those

_uqX

suffixes were created by magic during extraction. A guess, but I wonder if you have unconnected VPWR and VGND in a couple of places.

that's a good tip. thanks, i'll dig