When setting Soul Sand on fire, it makes Soul Fire.
This is incorrect as it has been stated by a dev that it is by design that only Soul Soil produces Soul Fire, and this is also how it is on Java Edition.
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is duplicated by 1
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This is working as intended, see MCPE-65429 and MC-174467.
Plans changed during development. As of Java Edition 20w12a, fire on Soul Sand becomes Soul Fire and Bedrock mirrors the behavior properly, as intended.