GCC and Bookworm issues with Arduino UNO WIFI Rev 2 board

After installing all boards/libraries etc with new RPi OS upgrade everything works really smooth. The arduino IDE 1.8.19 runs well...
I can compile and upload for all my different boards except the UNO WIFI Rev2. I have removed board def, reinstalled, rebooted, installed prior versions and nothing seems to get over this error...
It was working before the upgrade.

Adding additional verbose error messages...

Arduino: 1.8.19 (Linux), Board: "Arduino Uno WiFi Rev2, None (ATMEGA4809)"

arduino-builder -dump-prefs -logger=machine -hardware /usr/share/arduino/hardware -hardware /home/rick/.arduino15/packages -hardware /home/rick/Arduino/hardware -tools /usr/share/arduino/hardware/tools/avr -tools /home/rick/.arduino15/packages -libraries /home/rick/Arduino/libraries -fqbn=arduino:megaavr:uno2018:mode=off -vid-pid=03EB_2145 -ide-version=10819 -build-path /tmp/arduino_build_168707 -warnings=none -build-cache /tmp/arduino_cache_356267 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=/home/rick/.arduino15/packages/arduino/tools/arduinoOTA/1.3.0 -prefs=runtime.tools.arduinoOTA-1.3.0.path=/home/rick/.arduino15/packages/arduino/tools/arduinoOTA/1.3.0 -prefs=runtime.tools.avr-gcc.path=/home/rick/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino5 -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino5.path=/home/rick/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino5 -prefs=runtime.tools.avrdude.path=/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17 -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17 -verbose /home/rick/Arduino/nRF2401-Transmitter/nRF2401-Transmitter.ino
arduino-builder -compile -logger=machine -hardware /usr/share/arduino/hardware -hardware /home/rick/.arduino15/packages -hardware /home/rick/Arduino/hardware -tools /usr/share/arduino/hardware/tools/avr -tools /home/rick/.arduino15/packages -libraries /home/rick/Arduino/libraries -fqbn=arduino:megaavr:uno2018:mode=off -vid-pid=03EB_2145 -ide-version=10819 -build-path /tmp/arduino_build_168707 -warnings=none -build-cache /tmp/arduino_cache_356267 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=/home/rick/.arduino15/packages/arduino/tools/arduinoOTA/1.3.0 -prefs=runtime.tools.arduinoOTA-1.3.0.path=/home/rick/.arduino15/packages/arduino/tools/arduinoOTA/1.3.0 -prefs=runtime.tools.avr-gcc.path=/home/rick/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino5 -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino5.path=/home/rick/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino5 -prefs=runtime.tools.avrdude.path=/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17 -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17 -verbose /home/rick/Arduino/nRF2401-Transmitter/nRF2401-Transmitter.ino
Using board 'uno2018' from platform in folder: /home/rick/.arduino15/packages/arduino/hardware/megaavr/1.8.8
Using core 'arduino' from platform in folder: /home/rick/.arduino15/packages/arduino/hardware/megaavr/1.8.8
Warning: platform.txt from core 'Arduino megaAVR Boards' contains deprecated compiler.path={runtime.tools.avr-gcc.path}/bin/, automatically converted to compiler.path=/usr/bin/. **Consider upgrading this core.**
Detecting libraries used...
"/usr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega4809 -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_UNO_WIFI_REV2 -DARDUINO_ARCH_MEGAAVR -DMILLIS_USE_TIMERB3 "-I/home/rick/.arduino15/packages/arduino/hardware/megaavr/1.8.8/cores/arduino/api/deprecated" "-I/home/rick/.arduino15/packages/arduino/hardware/megaavr/1.8.8/cores/arduino" "-I/home/rick/.arduino15/packages/arduino/hardware/megaavr/1.8.8/variants/uno2018" "/tmp/arduino_build_168707/sketch/nRF2401-Transmitter.ino.cpp" -o "/dev/null"
Generating function prototypes...
"/usr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega4809 -DF_CPU=16000000L -DARDUINO=10819 -DARDUINO_AVR_UNO_WIFI_REV2 -DARDUINO_ARCH_MEGAAVR -DMILLIS_USE_TIMERB3 "-I/home/rick/.arduino15/packages/arduino/hardware/megaavr/1.8.8/cores/arduino/api/deprecated" "-I/home/rick/.arduino15/packages/arduino/hardware/megaavr/1.8.8/cores/arduino" "-I/home/rick/.arduino15/packages/arduino/hardware/megaavr/1.8.8/variants/uno2018" "/tmp/arduino_build_168707/sketch/nRF2401-Transmitter.ino.cpp" -o "/tmp/arduino_build_168707/preproc/ctags_target_for_gcc_minus_e.cpp"
avr-g++: error: device-specs/specs-atmega4809: No such file or directory
exit status 1
Error compiling for board Arduino Uno WiFi Rev2.

I've corrected the warning in platform.txt...

I am able to find this file at ...

I was able to search and found the file in question...

/home/rick/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino5/lib/gcc/avr/7.3.0/device-specs

but am unsure what or where the path is or should be...

Start with the reported platform.txt warning and the avr-g++ command for the Arduino Uno WiFi Rev2, then inspect the avr-gcc 7.3.0 device-specs directory at the path provided in the issue. Reproduce the compile failure and determine why device-specs/specs-atmega4809 is not found. Done means the sketch compiles successfully for the Uno WiFi Rev2 on the reported Raspberry Pi OS setup.

Written by the indexing model from the issue text.