The plugin causes recursive block rendering and PHP memory exhaustion

Hi Ollie team,

We are seeing a severe memory exhaustion issue when using the Ollie Menu Designer plugin, specifically with the Mega Menu / dropdown block inside a WordPress Navigation block.

The issue appears to be caused by recursive block rendering, where the mega menu render file calls a block template part, which then renders navigation blocks again, eventually looping until PHP memory is exhausted.

Environment:

• Plugin: Ollie Menu Designer Version 0.3.0
• Server: Nginx + PHP-FPM
• PHP memory limit: 800 MB / 838860800 bytes
• Issue occurs in both editor/frontend depending on the menu setup
• Browser used during testing: Chrome on macOS

What happened:

• After enabling and heavily using Ollie Menu Designer, especially dropdown/mega menu blocks inside navigation, the editor stopped loading.
• The frontend also started returning 502 errors.
• Disabling the Ollie Menu Designer plugin immediately restored the site.
• Increasing PHP memory is not a proper fix because the script is already exhausting around 800 MB.

Example PHP fatal errors:

PHP Fatal error: Allowed memory size of 838860800 bytes exhausted (tried to allocate 20480 bytes) in /wp-includes/block-template-utils.php on line 230
PHP Fatal error: Allowed memory size of 838860800 bytes exhausted (tried to allocate 20480 bytes) in /wp-includes/block-template-utils.php on line 212
PHP Fatal error: Allowed memory size of 838860800 bytes exhausted (tried to allocate 20480 bytes) in /wp-includes/blocks.php on line 1699

Relevant plugin file from the stack trace: /wp-content/plugins/ollie-menu-designer/build/blocks/mega-menu/render.php

render()
render_block()
do_blocks()
block_template_part()
/wp-content/plugins/ollie-menu-designer/build/blocks/mega-menu/render.php:146
render()
render_block()
do_blocks()
block_template_part()
/wp-content/plugins/ollie-menu-designer/build/blocks/mega-menu/render.php:146

Could you please check the rendering logic in: build/blocks/mega-menu/render.php especially around line 146 where block_template_part() appears in the stack trace? It may need a recursion guard, depth limit, or validation to prevent a mega menu block from rendering a template/navigation structure that contains itself again. Please let me know if you need any more logs, plugin version details, screenshots, or access to a reproduction setup.