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Thanks, Elliot
Bug Fix for Taxonomies and Revisions [Solved]
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I have found a bug in the handling of revisions in ACF. This came to light when using the Taxonomy plugin, which was failing to apply terms to the post when its Set Post Terms option was enabled. Others suggested that disabling Wordpress revisions was a workaround, and in doing more digging, I found a solution by modifying the ACF core.
ACF seems to be aware that when a post is amended with revisions enabled, that the save_post action gets called twice, once for the revision and once for the parent post. The logic employed in ACF to deal with this was too primitive, and meant that terms being added to the post taxonomies were not being applied correctly.
Two files contain the same error in logic.
advanced-custom-fields/core/controllers/input.php, starting line 402
advanced-custom-fields/core/controllers/field-group.php, starting line 501
Detail on the fix can be found in the Taxonomy field's support forums on Github, follow this link:
https://github.com/GCX/acf-taxonomy-field/issues/11#issuecomment-7152662
Hopefully this fix can be rolled into the next ACF release.
