When placing fire on soul soil using a flint and steel I found it sometimes appeared red for a moment
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Thank you for your report!
We're actually already tracking this issue at MCPE-74540, so I will resolve and link this ticket as a duplicate.
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I think the flint and steel automatically places normal fire. On the next tick, the fire responds to the block update (from its placement) and turns into soul fire.
The impacts of this bug are pretty minor; I can only think of uprooting mushroom by accident (since soul fire emits a lower light level) which is an edge case.