Looking for someone to confirm an issue on Teensy 4.1

[KL-Turner]

Using a very simple sketch and StandardFirmata loaded onto a Teensy 4.1, I am able to record from analog channels A0 and A1 (pins 14, 15) without issue. However, I am completely unable to record from any other analog pins on the Teensy 4.1 above that. I have #define TEENSY41 in both StandardFirmata.ino and in Boards.h. I originally thought that there was a misconfigure between the default pinout and what Bonsai/Firmata were recognizing, but the default pinout should be an Arduino Uno and pins 14-19 are, to my knowledge, Analog. Running a few simple Serial Monitor outputs added to StandardFirmata, I am pretty sure that pin 16 is being read as analog and that the board is being read identified correctly as a Teensy 4.1. However, when closing arduino's IDE and trying to record from that analog pin in Bonsai, there's simply no output on a rolling graph.

Perhaps equally as strange, if I set the AnalogInput source to something below 14 (such as pin 2) it does record a signal (noise) but these aren't actually analog channels on the physical Teensy, so if I switch my input signal (a rotary encoder in this case) to that pin, the signal doesn't change as it does on pins 14 or 15 (A0/A1).

If anyone knows the solution to what I am doing wrong, I would be incredibly grateful. Otherwise I am seemingly stuck to only 2 analog inputs on this device. Otherwise, is anyone able to record an analog signal from pin 16 on a Teensy 4.1? I tried 3 different Teensy and they all give the same behavior, but I am running the same Firmata/Bonsai code on each. For example, AnalogInput (COM#, 16) -> RollingGraph. I thought perhaps the CreateArduino block would help, but no luck. I tried several baud rates as well, 9600, 57600, so forth. My only changes to StandardFirmata.ino and Boards.h were #define TEENSY41 at the very top, and those were added because if you compile/upload the original sketch to the Teensy it gives a warning that it incorrectly assumes its a TEENSY40.