Eval error on MATLAB expressions from ADE/Maestro outputs

For our design we need to perform post-processing of a few waveforms using MATLAB, so we set up a matlabexpr in our Maestro testbench.

So far it works for single point simulations, but the expression sometimes fails to evaluate when the simulation is performed over multiple points by sweeping a design variable or parameter. Oddly enough, the first simulation point gets evaluated correctly, but for the last ones it gives an "eval err" as output.

To debug the problem I modified our post-processing MATLAB function to write a log file as a way to determine where the expression fails to evaluate, and it seems that MATLAB is not even started when the outputs of the second simulation point (and all the remaining points) are evaluated as the log file is unmodified after the first successful evaluation.

With sstatus(errsetTrace t) and _stacktrace=50 I could pinpoint that the issue is in an internal ADE function:

However, I'm totally unable to understand what I should try to fix this issue.

It seems to be reproducible all the time. These are the steps to perform to replicate the issue:

1. Launch Virtuoso and open a Maestro view with a matlabexpr.
2. Start a sweep simulation. All the matlabexpr should evaluate correctly.
3. Start a single point simulation. The matlabexpr should still evaluate correctly.
4. Start a sweep simulation. Now, the first evaluation is successful, while the remaining ones fail.

Our MATLAB version is r2023b and we are running Virtuoso Studio IC23.1-64b.ISR2.29