As this model contains prominent intersecting planes, the current behaviour may be intended as per MC-96463.
As this is an animated texture, this may be difficult to see, so a dedicated resource pack to replace the animated textures with static textures is included.
Fixed model json attached.
Linked issues
relates to 17
MC-199237
Back of ladder is incorrectly mirrored
Resolved
MC-199239
Vines appear incorrectly mirrored when viewed from behind
Resolved
MC-199241
Texture planes of cross models appear incorrectly mirrored from behind
Resolved
MC-199242
Texture planes of crop models appear incorrectly mirrored from behind
Resolved
MC-199248
Potted cross models appear incorrectly mirrored on the rear
Resolved
12 more links
See images in comments of MC-199241 The model will look weird from some directions if you you mirror the backfaces.