MultiClockSpec chiselTest fails with recent Verilator version

**Type of issue**: Bug Report

**Please provide the steps to reproduce the problem:**

Install Verilator >= v5.046, then run `./mill chisel[].test.testOnly chiselTests.MultiClockSpec`

```
[40] %Error: ClockDividerTest_Verification_Assert.sv:72: Assertion failed in TOP.svsimTestbench.dut.verification_assert: Assertion failed at MultiClockSpec.scala:26
```

Problem not flagged by CI, because the Chisel CI pipeline uses a nightly build from verilator, provided by oss-cad-suite on 2023-06-21.
```
./verilator --version
Verilator 5.013 devel rev v5.012-12-g9ee5fd058
```

I confirmed that the testcase passes if using Verilator <= v5.044.

**What is the expected behavior?**
The ClockDividerTest should pass, independent of simulator version.

**Please tell us about your environment:**
Verilator v5.046 on linux-x64.