Biscotti is only on the older drivers.
The newer ones have 12Group(which is a slightly modified version of Biscotti).
Either way it’s a hardware issue not a firmware issue.
The 12Group drivers come with a bleeder resistor installed, which is what the Illuminated tailswitch needs to power it.
You can add a bleeder to any driver, though some are easier than others.
If LVP is an issue for anyone you can get/build an illuminated tailcap with LVP.
Several members have designed them.
I personally use gCharts LVP CC.
I really like the look of the 4 LEDs:
