Proposed resolution:

To fix this, rephrase the sentence above to allow pubimbue to do what it was designed to do. Specifically. change [iostream.limits.imbue], p1 to read:

No function described in clause 27 except for ios_base::imbue and basic_filebuf::pubimbue causes any instance of basic_ios::imbue or basic_streambuf::imbue to be called. ...