When crafting using a crafting table, about half the time the items crafted just disappear. I have to close the game and reopen it several times for the issue to go away, then it comes back 5 minutes later. This has happened to me while crafting bonemeal, bone blocks, and dark prismarine. This bug is insanely annoying and game-breaking. I've included several videos of this happening.
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This is happening to me on PC as well. Some items crafted successfully, such as kelp blocks, but every time I tried to convert redstone blocks to dust or craft comparators, the materials would be removed from my inventory and the crafted item will appear briefly before disappearing completely. Definitely game breaking.

This has been reported in duplicate reports to happen when crafting many items, including:
bone meal
bone blocks
prismarine
coal (from coal blocks)
reverse-crafting other storage blocks: hay bale, slime block, block of gold, block of emerald
buckets (also see MCPE-52774)
Also when repairing weapons in the crafting table.

This is happening to me on Nintendo Switch when crafting paper from sugarcane using the 'craft stack' button.
Furthermore, once this has happened, it also seems to create ghost entries in your inventory that then prevent you from being able to do anything else that may fill those spaces. An example of this is trading with villagers - any emeralds you get will be immediately removed from your inventory although you see them for a fraction of a second.
Once you close the app and restart it, the issue seems to be fixed - you will be able to craft and you will be able to trade again.

Also worth noting that this issue only appears to happen when you are crafting very quickly - slow and deliberate button presses can be used to avoid it.
For those that are experiencing the issue(s) mentioned, could you please let us know if this is happening in a Realm only, or whether this can happen in a local or normal multiplayer world?

All of my experience of this is in a Realm. Will perform further tests in a single-player world later.

For me it's happening on a local multiplayer world.

Confirmed for realms. Happens less often. It broke once after a long time, then started working next day. It hasn't broke since.
When I say broke, I mean can't craft and takes items

Issue in 1.13.1

Had this happen on both single and mutli-world.

Only when you full slots may appear invisible when your cursor would be not shown.

make sure there are no items lying at your feet especially when bulk crafting

The problem is definitely not having crafted items dropping at the player's feet. It appears that once you get into the state of items disappearing it can only be fixed by quitting and re-entering the game.
This is possibly related to not having any available space when crafting multiple items as a stack, perhaps when there would be single input item left. I have had it happen crafting a stack of paper. Because an odd number of sugarcanes are needed in the recipe, it cannot come out to exactly 64 paper crafted, so 1 sugarcane should be left and 63 paper crafted. But then there is no place to put the crafted paper. Sometimes that seems to confuse the game.

Some random items on a realm I have often dont craft the item into my inventory. The game takes the items to be crafted but doesnt then deposit the crafted item into my inventory. There is no specific items it sticks too. It is and can be any random item i may be crafting. This is also happening to players, playing on the realm.