Picture with serveral source and srcset

Hello,

In my project, I need to have different image on mobile and desktop. I also want to be able to manage responsive with sizes and also use webP.
Everything was fine until I installed the plugin. It made the srcset disappear even as I uninstall it 🙁

I am therefore starting from the beginning. What did I miss?

<?php $photoID = get_field('photo'); // GET THE ID OF THE IMG ?>
<picture>
   <source srcset="<?php echo wp_get_attachment_image_srcset($photoID, 'slider'); ?>" media="(min-width: 601px)"/>
   <source srcset="<?php echo wp_get_attachment_image_srcset($photoID, 'slider-mobile'); ?>" media="(max-width: 600px)"/>
   <img src="<?php echo wp_get_attachment_image_url($photoID, 'slider-mobile'); ?>" alt="" />
</picture>

The objective is to obtain (on browser which support webp) :

<picture>
   <source srcset="slide-little.webp 300w, slide-medium.webp 650w, slide-large.webp 1000w" media="(min-width: 601px)"/>
   <source srcset="slidemobile-little.webp 300w, slidemobile-medium.webp 650w, slidemobile-large.webp 1000w" media="(max-width: 600px)"/>
   <img src="slidemobile-little.webp" alt="" />
</picture>

Please help me!
Many thanks!