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Swords in 1.12 seem to be rotated incorrectly in item frames with the 3D Items add-on pack.
Screenshots attached. Swords have been placed in item frames and rotated to face downward. One is normal (no 3D items pack; swords point downward) and the other is with 3D items (swords point rightward; 2 rotations backwards from what they should be).
This was tested with 1.12 r3 512x. No other resolutions were tested, and no other items have caught my attention of having this issue (yet).