I don't have it locally, tried in playground instead.
https://biomejs.dev/playground/?enabledLinting=false&files.main.html=PABpAG4AcAB1AHQAPgAKADwAaQBtAGcAPgAKADwAYgByAD4ACgA%3D
Since there are no self-closing tags in HMTL, Biome should keep valid void elements formatting.
Leading slash should be added only where self-closing tags are valid: within XML-like content such as svg, xml or JSX.
For these who want to keep having broken Prettier formatting of void HTML tags, there could be a configuration option.
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