Some GUI interactions are missing from statistics

The bug

Statistics track various kinds of interactions with user interfaces, involving both blocks and entities. Below is a list with every one of those cases, as of 19w11b:

• Talked to villagers

• Traded with villagers

• Shulker boxes opened

• Chests opened

• Trapped chests triggered

• Ender chests opened

• Barrels opened

• Dispensers searched

• Droppers searched

• Hoppers searched

• Interactions with crafting table

• Interactions with brewing stand

• Interactions with beacon

• Interactions with furnace

• Interactions with blast furnace

• Interactions with lectern

• Interactions with smoker

• Interactions with anvil

• Interactions with smithing table

• Shulker boxes opened

However, the game has some similar interactions that, unlike the ones in the list above, are NOT tracked in the statistics:

• Open own inventory

• Horse

• Enchanting table

• Minecart with chest

• Minecart with hopper

• Anvil _{added in 1.15.2-pre2}

• Grindstone _{added in 1.14-pre2}

• Stonecutter _{added in 1.14-pre2}

• Cartography table _{added in 1.14-pre2}

• Loom _{added in 1.14-pre2}

• Stonecutter _{added in 1.14-pre2}

• Fletching table  _{functionality upcoming}

• Smithing table  _{functionality upcoming}

• Command blocks  _{not available in Survival}

• Structure blocks  _{not available in Survival}

I can see no particular reason for these interactions to not be tracked. So, my guess is that whoever added them to the statistics just missed the cases above.