I do have a bit of custom stuff in my personal.ini to add "Oneshot" to my status column. I wonder if that could somehow be tripping up the anthology status code, but I'm not sure how. My anthologies do tend to consist of series of oneshots though.
Code:
custom_columns_settings:
oneshot=>#fanficstatus
replace_metadata:
## Sets one-chapter fics to oneshot
oneshot=>Completed=>Oneshot&&numChapters=>^1$
# 'add_to_' concats on to existing param, thus the leading comma
add_to_extra_valid_entries:,oneshot,
# oneshot is a copy of status because status itself isn't a list.
include_in_oneshot:status