Cauldron with magma disappears when /fill air destroy is performed

Observed Result

• If I destroy a cauldron with magma in it with /fill ~ ~ ~ ~ ~5 ~5 ~5 ~5 air [] destroy and try to itemize it, it will disappear without being itemized!

Expected Result

• It is confusing that cauldrons that can be itemized without the need for silk touch are not itemized by the Destroy command!
  I think the correct answer is that the cauldron is itemized no matter what is in it.