Articles created in gallery format do not work in Joomla 3.10 and also in Joomla 4, I have tested it in Helix Ultimate 2.0.0 and 2.0.1. You can see in the video that the console does not show errors, I hope you find what the problem is.
The video is here https://www.screencast.com/t/6vQUatltFUb7, the tests I have done locally.
