False-positive : "[EA] Could provoke a PHP Fatal error ([] operator not supported for strings)" in test

[uncaught]

Subject	Details
Plugin	Php Inspections (EA Extended) 5.0.0.0
Language level	PHP 8.2

Current behaviour

When assigning a string to a static array in a test class, EA reports this as a fatal error, but only if this was done in the setUpBeforeClass method of phpunit. This is quite weird, but see:

The error is "[EA] Could provoke a PHP Fatal error ([] operator not supported for strings)".

If I rename setUpBeforeClass to something else or comment it out completely, the assignment is not reported as fatal:

Expected behaviour

The property type is defined as array and EA should not assume this to be a string for some reason.

Environment details

PhpStorm 2023.2.3 on Windows 10
Code in WSL (Ubuntu 20)