java parity issue. They can be placed on those blocks on java but not bedrock
Linked issues
Comments 2
Thank you for your report!
We're tracking this issue in MCPE-130695, so this ticket is being resolved and linked as a duplicate.
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Temporary Solution
Place a solid block in replacement of the block you'd like to place the candle on top of (e.g. fence post, wall, top-half slab, etc).
Place candle on top of the solid block.
Break the solid block below it.
Place the preferred block underneath it (e.g. fence post, wall, top-half slab, etc).