node-red-node-pi-gpio and node-red-contrib-python3-function don't work on Ubuntu 20.10

Which node are you reporting an issue on?

node-red-node-pi-gpio
node-red-contrib-python3-function

What are the steps to reproduce?

Using image ubuntu-20.10-preinstalled-desktop-arm64+raspi.img.xz
sudo apt update
sudo apt upgrade
sudo apt full-upgrade

sudo rpi-eeprom-update
#CURRENT: Thu 03 Sep 2020 12:11:43 PM UTC (1599135103)

#GPIO support
sudo groupadd -f --system gpio
sudo groupadd -f --system i2c
sudo groupadd -f --system spi
sudo groupadd -f --system input
sudo usermod -a -G gpio root
sudo usermod -a -G i2c root
sudo usermod -a -G spi root
sudo usermod -a -G input root
sudo usermod -a -G gpio user
sudo usermod -a -G i2c user
sudo usermod -a -G spi user
sudo usermod -a -G input user
sudo chown root:gpio /dev/gpiomem
#use 99-com.rules from rasbian OS
#99-com.rules

SUBSYSTEM=="input", GROUP="input", MODE="0660"
SUBSYSTEM=="i2c-dev", GROUP="i2c", MODE="0660"
SUBSYSTEM=="spidev", GROUP="spi", MODE="0660"
SUBSYSTEM=="bcm2835-gpiomem", GROUP="gpio", MODE="0660"

SUBSYSTEM=="gpio", GROUP="gpio", MODE="0660"
SUBSYSTEM=="gpio*", PROGRAM="/bin/sh -c '\
        chown -R root:gpio /sys/class/gpio && chmod -R 770 /sys/class/gpio;\
        chown -R root:gpio /sys/devices/virtual/gpio && chmod -R 770 /sys/devices/virtual/gpio;\
        chown -R root:gpio /sys$devpath && chmod -R 770 /sys$devpath\
'"

KERNEL=="ttyAMA[01]", PROGRAM="/bin/sh -c '\
        ALIASES=/proc/device-tree/aliases; \
        if cmp -s $ALIASES/uart0 $ALIASES/serial0; then \
                echo 0;\
        elif cmp -s $ALIASES/uart0 $ALIASES/serial1; then \
                echo 1; \
        else \
                exit 1; \
        fi\
'", SYMLINK+="serial%c"

KERNEL=="ttyS0", PROGRAM="/bin/sh -c '\
        ALIASES=/proc/device-tree/aliases; \
        if cmp -s $ALIASES/uart1 $ALIASES/serial0; then \
                echo 0; \
        elif cmp -s $ALIASES/uart1 $ALIASES/serial1; then \
                echo 1; \
        else \
                exit 1; \
        fi \

sudo mv 99-com.rules /etc/udev/rules.d
sudo udevadm control --reload-rules && sudo udevadm trigger

#misc
sudo adp intsall -y curl

#Python3
sudo apt install -y python3 python3-dev
sudo apt install -y python3-pip

#Python3 GPIO
sudo apt install -y python3-rpi.gpio
sudo python3 -m pip install gpiozero

#I verfied using PyCharm that both RPi.GPIO and gpiozero import and work at this step

#NodeRED
#https://nodered.org/docs/getting-started/raspberrypi
sudo apt install -y build-essential git
sudo apt-get install nodejs
sudo apt install -y npm
sudo npm install -g --unsafe-perm node-red
sudo npm install -g --unsafe-perm node-red node-red-admin
sudo npm install -g --unsafe-perm node-red-contrib-python3-function
sudo npm install -g --unsafe-perm node-red-contrib-uibuilder
sudo npm install -g --unsafe-perm node-red-dashboard
sudo npm install -g --unsafe-perm node-red-node-pi-gpio
sudo npm install -g --unsafe-perm node-red-node-random
sudo npm install -g --unsafe-perm node-red-node-ping
sudo npm install -g --unsafe-perm node-red-contrib-play-audio
sudo npm install -g --unsafe-perm node-red-node-smooth
sudo npm install -g --unsafe-perm node-red-node-serialport
npm config set update-notifier false
npm rebuild --unsafe-perm
sudo ufw allow 1880
#In /usr/bin, copy python3 and rename as python. Otherwise python3 and GPIO won't work!
node-red

#Receive the error:
#/bin/sh: 1: /usr/local/lib/node_modules/node-red-node-pi-gpio/testgpio.py: not found

#Create GPIO input and output nodes via webpage
#Deploy flow, test. Does not work.

#Create Python3 Script node via webpage
#Deploy flow, test. Does not work, crashes NodeRed.

What happens?

RPi-GPIO module does not load. IO fails to work. See N/A on node status text.
Python3 script causes NodeRed to crash/shutdown

What do you expect to happen?

I expected the modules to load/work

Please tell us about your environment:

• Node-RED version: 1.2.6
• node.js version: 14.15.1
• npm version: 6.4.8
• Platform/OS: Raspberry Pi 4Model B 4GB firmware version 1599135103, ubuntu-20.10-preinstalled-desktop-arm64+raspi.img.xz (problem also occurs in UbuntuMate 20.04 Raspberry Pi image)
• Browser: FireFox

The root cause is that there is no python command, only python3.
node-red-node-pi-gpio and node-red-contrib-python3-function both appear to reference python and assume it will map to python3, but this isn't true in most cases.
I can fix the issue by going into /usr/bin, copying python3 to the filename python. After that, everything works as expected.

Start by inspecting the node-red-node-pi-gpio entry point and /usr/local/lib/node_modules/node-red-node-pi-gpio/testgpio.py, then compare how node-red-contrib-python3-function launches Python. Reproduce the flows on the stated Ubuntu Raspberry Pi setup; done means both nodes load and execute without requiring a manually created python alias.