Setting soul sand on fire does not create soul fire

Thank you for your report!
However, this issue is Invalid.

The behaviour currently in the BETA is in line with the releases in the JAVA snapshots and as such this isn't a bug. Soul Sand remains red as it has always been, the blue variant is strictly for the new Soul Soil block.

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Ionic

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Reopening, this was a bug in Java Edition and fixed in 20w12a.

Soul Soil doesn't have a blue flame either. Moderators need to stop dismissing us!

This needs to be reopened, its still around in 1.16.0.59, kinda.

Here are my test results from messing around with this issue. All tests were done in 1.16.0.59 or 20w18a.

Bedrock edition, worlds generated before beta:
Neither soul sand nor soul soil have blue fire when lit with a flint and steel.
Bedrock edition, new worlds generated in the 1.16 betas:
Both soul sand and soul soil have blue fire when lit with a flint and steel.
Java edition, new worlds generated in 1.16 snapshots:
Both soul sand and soul soil have blue fire when lit with a flint and steel.

I loaded a world from 1.14 in 1.16 and was not able to reproduce what you are describing. Can you check whether the gamerule dofiretick is disabled in the worlds generated before 1.16? If it's disabled, then you are experiencing MCPE-69823.

As I tested out the soul fire on soul soil mechanic in Beta 1.16.0.61 and the fire didn't convert into soul fire. I thought it was only exclusive in the Nether, so I went there and tested it out, and the result was unchanged.