When I run the report_drc command on a partial reconfiguration design targeting UltraScale devices, DRC HDPR-31 is reported:

HDPR-31
HDPR #1 Warning 182972 cells with INIT values are found without resets. Without a reset the INIT value will not be loaded during a partial reconfiguration.
To fix this issue: add a reset to each cell that can be held during and released after a partial reconfiguration.
The following is a list of cells (up to the first 15) with INIT values that need to have resets:
TOP/r_EG_IN_Buf_reg[0][0][0] (1'b0)
TOP/r_EG_IN_Buf_reg[0][0][10] (1'b0)
TOP/r_EG_IN_Buf_reg[0][0][11] (1'b0)
TOP/r_EG_IN_Buf_reg[0][0][12] (1'b0)
...