Handling of a bit array

Handling of a bit array

Hello,
recently we moved from 7.24.2066 to 8.1.151.
Is there a difference now in handling a bit array? In the database there is a field of type "bit(7)". When filling a datatable (PgSqlDataAdapter.Fill), there is a different result in the corresponding BitArray property:

old version: "1111110" -> (true, true, true, true, true, true, false)
new version: "1111110" -> (false, false, true, true, true, true, true)

Is there a reason for that? Thank you in advance.