The cause of this epidemic is the space between |Died Year= and 1931. It would count as a bug, but not a huge priority with other things needing to be done at this point (it *will* be fixed, however).
The autotagger reads as many numbers as it can after the = sign, but it does not take into account any whitespace between the = and the number. Thus, it stops when it finds a space after the =.
I've fixed the D'Indy page, but caches may mean that it will take up to 3 days to take effect.