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Only h2 can be confirmed in the heading block style preview #18424
Of course, eliminating the example setting solves this problem, but without the example setting, the preview in the block inserter help menu (.block-editor-inserter__menu-help-panel) cannot be displayed.
I think that there is a problem with the processing method that the "preview screen in the help menu of the block inserter" and the "block style preview screen" refer to the same "example".
I think it would be nice to be able to divide the process well between the two types of preview screens, but I'm not mature enough to come up with a concrete good solution.