Peak shaving not working when slow charging ESS #5

I have the following setup: Multiplus 3000/48 with 2 Pytes V5 alpha batteries and Cerbo GX.

When the system is slow charging the batteries (ESS #5) the peak shaving is not working.

With ESS #1 and ESS #2 the peak shaving limit is respected.

I tested it with Venus OS v3.67 and v3.70~78.

Is this a bug or could this be caused by a wrong setting?