strange behaviour: In Twenty Twenty Five Theme the Custom block Created through Plugin automatically gets added in sidebar area?

strange behaviour: In Twenty Twenty Five Theme the Custom block automatically gets added in sidebar area?

It is also ouputting render.pho content on front page.

block.json —

{
    "$schema": ".json",
    "apiVersion": 3,
    "name": "woracioussuite/custom-sidebar-menu",
    "version": "0.1.0",
    "title": "Custom Nav",
    "category": "theme",
    "icon": "smiley",
    "description": "Example block scaffolded with Create Block tool.",
    "example": {},
    "supports": {
        "html": false
    },
    "textdomain": "woracious-suite",
    "editorScript": "file:./index.js",
    "editorStyle": "file:./index.css",
    "style": "file:./style-index.css",
    "viewScript": "file:./view.js",
    "render": "file:./render.php"
}