(Closed)Update changes albumtype to array?

Edit # 2: This is a known bug in 1.6.0. https://github.com/beetbox/beets/pull/4582

When I run beet update it seems to change the albumtype field from a string to a character array. Is this expected behavior?

albumtypes: album → [‘a’, ‘l’, ‘b’, ‘u’, ‘m’]
albumtypes: other; spokenword → [‘o’, ‘t’, ‘h’, ‘e’, ‘r’, ‘;’, ’ ', ‘s’, ‘p’, ‘o’, ‘k’, ‘e’, ‘n’, ‘w’, ‘o’, ‘r’, ‘d’]

from the info plugin:
albumtypes: [‘a’, ‘l’, ‘b’, ‘u’, ‘m’]


Edit: It seems to also change albumtype to just the first letter. albumtype: album → a