Reading the strings of text that dictate the pack incompatibility message, an inconsistency can be found.

"pack.incompatible.confirm.old": "This pack was made for an older version of Minecraft and may no longer work correctly."
"pack.incompatible.confirm.new": "This pack was made for a newer version of Minecraft and may not work correctly."

A current method of fixing this for normal users is to use the attached resource pack. (should work)