The blue fire from the new biome in the nether update doesn't give you the same color, when you walk on it.
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Thank you for your report!
We're actually already tracking this issue at MCPE-66081, so I resolved and linked this ticket as a duplicate.
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I think you don't burn blue because you donot contain soul soil.
This is true to real life, where the color of a flame depends on the material that is burning, and not the color of a "parent" flame.
In any case, this report is more of a feature request, since players and mobs burning blue would be a new feature. You can make feature requests on the feedback site.