False positive may not support offset operations for mb_str_split

[Simbiat]

Subject	Details
Plugin	Php Inspections (EA Extended)
Language level	PHP 8.3

Current behaviour

$test = mb_str_split('test', 1, 'UTF-8');
$test[1] = 0;

Highlights 2nd line

I assume this is because it picks up polyfil

But it should not, since I am not in that namespace, technically. Adding \ before function does not help.

Expected behavior
No highlight, since only array can be returned by PHP

Environment details

PhpStorm 2024.1.1
Build #PS-241.15989.102, built on April 23, 2024
Licensed to simbiat.ru / Dmitry Kustov
Subscription is active until May 11, 2024.
For non-commercial open source development only.
Runtime version: 17.0.10+1-b1207.14 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Windows 11.0
GC: G1 Young Generation, G1 Old Generation
Memory: 5120M
Cores: 16
Registry:
  debugger.new.tool.window.layout=true
  run.processes.with.pty=TRUE
  ide.experimental.ui=true
Non-Bundled Plugins:
  com.jetbrains.space (241.15989.9)
  com.intellij.ml.llm (241.15989.102)
  com.kalessil.phpStorm.phpInspectionsEA (5.0.0.0)