cocotb: VCS Timescale Mismatch?

I have a design that has a clock with a period of 10 (in default cocotb units), and a simulation that runs for 8508 cycles. What I see in the report for VCS is the following:

*********************************************************************
** TEST         PASS/FAIL  SIM TIME(NS)  REAL TIME(S)  RATIO(NS/S) **
*********************************************************************
** tb.test_app    PASS     85081000000000.00        [redacted]     **
*********************************************************************

Well, that’s not right, there are 9 extra 0s. 1ns is 1e-9s, so that’s a bit suspicious. What does Incisive say?

*********************************************************************
** TEST         PASS/FAIL  SIM TIME(NS)  REAL TIME(S)  RATIO(NS/S) **
*********************************************************************
** tb.test_app    PASS        85081.00        [redacted]           **
*********************************************************************

Ok, that looks correct.

What’s going on here? Did I misconfigure something or is there something wrong with how cocotb is setting up the VCS testbench?

In any case, it’s questionable that the same testbench is not consistent across simulators.