In the files for the plains village house structures there are two files referring to the temples: plains_temple_3 and plains_temple_4. However there are no files named either plains_temple_1 or plains_temple_2 thus leading to confusion and implying that those two files are missing or that plains_temple_3 and plains_temple_4 were missnamed.
Linked issues
duplicates 1
Comments 2
Duplicate of MC-172028
There are many inconsistent internal names, so I doubt that they are considered a bug.