The items can’t be stacked with others if they were dropped, or if you press X or A on the other stack
From Félix Laurin: It appears that we cannot stack items from that come from different conditions. I.e: we cannot stack "Stone blocks" that come from mining with a "Silk touch" pickaxe with "Stone blocks" that come from smelting, or we cannot stack "cooked salmon" cooked by a "fisherman villager" with "cooked salmon" cooked in a furnace.
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I appear to have a similar issue, though I believe the bug description is rather incomplete. So here's my experience: It appears that we cannot stack items from that come from different conditions. I.e: we cannot stack "Stone blocks" that come from mining with a "Silk touch" pickaxe with "Stone blocks" that come from smelting, or we cannot stack "cooked salmon" cooked by a "fisherman villager" with "cooked salmon" cooked in a furnace. You may see this comment on other similar threads. Thank you for reading. (Minecraft for windows 10)

Experiencing that same issue here, also on a Nintendo Switch.

Experiencing that same issue here, also on a Nintendo Switch.
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki

This issue still exists but it is very rare to happen

This report is actually a duplicate of MCPE-48421, which was fixed. See also MCPE-54617.

This report is actually a duplicate of MCPE-48421, which was fixed. See also MCPE-54617.
I appear to have a similar issue, though I believe the bug description is rather incomplete. So here's my experience: It appears that we cannot stack items from that come from different conditions. I.e: we cannot stack "Stone blocks" that come from mining with a "Silk touch" pickaxe with "Stone blocks" that come from smelting, or we cannot stack "cooked salmon" cooked by a "fisherman villager" with "cooked salmon" cooked in a furnace. You may see this comment on other similar threads. Thank you for reading. (Minecraft for windows 10)