I was trying to trade with Stone Mason Villagers, but I noticed the 20 Stone block trade is always blocked even though I have more than 20 of the correct stone blocks.
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Smelted and silk touch mined stone blocks do not stack together. At least the smelted ones cannot be traded with stonemasons.

Thank you for your report!
We're actually already tracking this issue at MCPE-48637, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
We are using MCPE-48421 as the ticket for the general issue of items not being able to be used after smelting
I am experiencing the same problem. I believe it has to do with stone blocks collected by silk touch vs smelted. One works and the other doesn't but I don't see any rhyme or reason for which is accepted. Will do more testing.