Modification of installed core files breaks compilation

[giacomocusinato]

Describe the problem

When IDE is open, modifying installed core files (like boards.txt or programmers.txt) leads to compilation not working with the following error logged in the console: The instance is no longer valid and needs to be reinitialized

To reproduce

• Open IDE
• Select any board (for example Arduino Nano, but any will do)
• Locate Arduino15 folder on your OS https://support.arduino.cc/hc/en-us/articles/360018448279-Open-the-Arduino15-folder
• Locate board.txt file relative to the board you selected (for Arduino Nano is Arduino15/packages/arduino/hardware/avr/1.8.6 )
• Modify the file board.txt in any way
• Compile the sketch

The error The instance is no longer valid and needs to be reinitialized should appear

Expected behavior

The compilation should proceed as expected as the IDE should handle the error silently.

Arduino IDE version

2.3.3

Operating system

macOS

Operating system version

15.0.1

Additional context

No response

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the latest nightly build
• My report contains all necessary details