Steps to reproduce the issue

Set in intro image in an article and also use an Image Class (my_image_class)

Expected result in html output (as in blog view)

figure class="my_image_class item-image">...</figure

Actual result

figure class="mod-articles-image item-image">...</figure

System information (as much as possible)

joomla 6.0.1, php 8.4

Additional comments

in /modules/mod_articles/src/Helper/ArticlesHelper.php (line 402 and 405)

$images->float_fulltext = 'mod-articles-image';

Without this assignment the expected result appear.