On VRM, Custom widgets, PV currents for MPPT (PV currents on tracker #n on MPPT RS) are not drawn. You can see that on my installation "test" on VRM in the last widgets at bottom: PV currents are just not displayed (and if only PV currents, like on last widget, there is just a "no data" there.
On standard widgets, like on top, PV currents are drawn. So it's a bug in VRM and not in VenusOS.