Offset does not work.

Works for me.

Try that (add some content above it so the blocks are below the fold):

<!-- wp:columns -->
<div class="wp-block-columns"><!-- wp:column -->
<div class="wp-block-column"><!-- wp:paragraph {"animationsForBlocks":{"animation":"slide","variation":"up","duration":2400}} -->
<p data-aos="slide-up" data-aos-duration="2400">Lorem</p>
<!-- /wp:paragraph --></div>
<!-- /wp:column -->

<!-- wp:column -->
<div class="wp-block-column"><!-- wp:paragraph {"animationsForBlocks":{"animation":"slide","variation":"up","duration":2400,"offset":512}} -->
<p data-aos="slide-up" data-aos-duration="2400" data-aos-offset="512">Ipsum</p>
<!-- /wp:paragraph --></div>
<!-- /wp:column --></div>
<!-- /wp:columns -->

The paragraph with the offset appears later.

Is it possible to fix it?

At the end of the day this plugin is supposed to put data-aos-offset="512" on the element and whether that functions or not is not up to me, but it concerns the AOS library itself so if something is not working then no, it’s not possible for me to fix it. If the data-aos-offset attribute doesn’t appear, then it should be possible to fix, but I’m going to need some reproduction steps.

Ah, I see. Actually, it works. My mistake. Thx.