Steps to reproduce:

Create an empty project in 7000.0.0a7
Open Window > Analysis > Project Auditor
Click Install Rules
Wait for the Rules package to finish installing
Click Start Analysis
Wait for the analysis to finish
Close the Project Auditor window
Quit the Editor
In Terminal, from the project folder, run

{{truncate -s 0 Library/projectauditor-report-autosave.projectauditor}}

10. Open the project in 7000.0.0a7
11. Open Window > Analysis > Project Auditor

Actual results: A NullReferenceException is logged when the window opens, and the autosave is not removed, so it is thrown again on every open

Expected results: The unreadable autosave is discarded with a warning, as an incompatible one already is

Reproducible with versions: 6000.3.26f1, 6000.6.4f1, 6000.7.0b3, 7000.0.0a7

Tested on (OS): macOS 27.0

Note: On 6000.3.26f1 Project Auditor is the com.unity.project-auditor 1.0.2 package, so there is no Install Rules step. With a cut-off autosave the Home page shows only an "Optimization" tab and nothing else, and throws a NullReferenceException on every repaint, also after an Editor restart.