It appears somewhere between ACF v5.8.9 and v5.8.13 (these are the versions I was updating from to) the default $is_preview variable (as seen in ACF Blocks: https://www.advancedcustomfields.com/resources/blocks/) is no longer hiding content from the front-end.
I use the same “is-admin” class in many blocks on my site, the same way Elliot does in his tutorial here: https://www.advancedcustomfields.com/blog/building-a-custom-slider-block-in-30-minutes-with-acf/, that class is now showing on the front-end, to logged out users. I didn’t make any other changes to my site besides updating to WordPress 5.5 (no issues) and then updating ACF and other plugins, none of which interact with ACF.
On further testing, it appears I must have not cleared my cache after the WordPress update. It seems the 5.5 update is the real culprit that’s breaking this. I updated just WordPress on a website with ACF v5.8.11 and recreated the issue.
I just updated to WordPress 5.5 and $is_preview is no longer working, as mentioned above.
This is a critical error – resulting in all ACF blocks no longer working on the front-end of the site.
How do we fix this?
I can confirm that $is_preview is now always returning true in WordPress 5.5. It would be great if you could fix it ASAP, because I’m using this conditional a lot (I was inspired by ACF documentation) and it will break all my latest websites that will automatically upgrade WordPress to version 5.5.
Thanks John, I have contacted support and reiterated and linked back to this thread. Hope this will have a solution soon!
Just wanted to follow-up with the rest of everyone here that is_preview content shows on the front-end in WordPress 5.5, I have as well submitted a bug report.
Submitting a bug report as I am seeing the same behaviour on 5.5.
I have a live site that relies heavily on is_preview to render content differently in Gutenberg versus the front end. Now is_preview is returning true on the frontend.
My guess is the culprit is /advanced-custom-fields-pro/pro/blocks.php line 523 if( !empty($query['preview']) ) {. Assuming $query['preview'] is no longer evaluating as empty on the frontend.
Unfortunately, I do not have a local install of wordpress with 5.5 to see what $query['preview'] evaluates to on the frontend as of the latest update and I am currently busy with a deadline.
Good luck with the bug hunting!
Hi all,
We have released a 5.8.14 update to take care of this bug – thanks again for your help!
Thanks so much! The update has fixed the issue on my sites.
This is not the case for me unfortunately. I use render_template, and the is_preview variable there is a block object, not a true/false variable.
WP 5.5, and acf-pro 5.8.14
