Why, on an attempt to paste a piece of text from an RTF file into Writer, an anchored frame appears instead?

LO 4.2.5 (Eng) - Writer, Win7 Pro (Eng)
Thanks beforehand.

Please have a look at
Bug 81835 - EDITING: default paste from MSWord/WordPad create image

Status: RESOLVED FIXED (LibreOffice 4.3.1).

See also: Can not copy-paste.