Why there is a warning or error message " (vlog-2256) Event expressions should result in a singular type" when I compile _phy_alt_mem_phy.v in EDA simulation tools?

Description

There is a missing syntax in <instance>_phy_alt_mem_phy.v line 1655.

always @(extended_value, extend_using_this_bit_mask, dwidth_scaled_pre_extend_array)

workaround code:

always @(extended_value, extend_using_this_bit_mask, dwidth_scaled_pre_extend_array[k])

by assigning packed array as sensitivity list, then compilation will pass.