As of 2024/03/23, the new Bold Animation Pack has inconsistent thumbnails compared to other animation packs.
For most other animation packs, including the Toy Animation Pack, the animation preview is displayed on a white blocky character with no clothing.
However, for the Bold Animation Pack the thumbnails are significantly more punched in, and a blocky character is used wearing clothing.
Expected behavior
For the issue with the clothing, either the new animation pack thumbnails could have the clothing removed, or a different bundle could be used to be more in line with how Emote thumbnails work.