ACF Blocks V3 - Saving in preview mode doesn't work reliably when you type fast within the input fields or manipulate text via keyboard shortcuts

[FalkoJoseph]

Describe the bug

Added a video of the bug below.

I am using the latest version of ACF Blocks V3 with version ACF PRO 6.6.1.

When you type within an input field (e.g. wysiwyg) in preview mode, the live preview is lagging behind when you type fast or use a keyboard shortcuts like copy & paste, alt+backspace or cmd+backspace.

The live preview can't keep up.

When the live preview is out of sync with what you just typed, it will wrongly save what is inside the preview mode, inside of the up to date content of your input field.

I've added a video of the bug below.

To Reproduce
Steps to reproduce the behavior:

1. Create an ACF block with a wysiwyg text field
2. Use the block in preview mode
3. Quickly type a sentence or a couple of words, quickly do a deletion of some words via alt+backspace or cmd+backspace
4. You will see the text in preview being out of sync with the text in the wysiwyg area
5. When you save the page, only the text from the preview will be saved. Not what you actually wrote in the wysiwyg.

Maybe the bug is also occurs on other input fields such as plain text or textarea, but I haven't tested these yet.

Expected behavior

The preview mode should be an accurate representation of what you type. Even if you type fast, or use keyboard shortcuts to manipulate text. When you're done typing, it should do a refresh after a couple of ms.

When saving an edited post, the saved post should always be what you just entered in a text or input field.
Otherwise editors may save posts or pages, and end up with broken text when they view the website.

Screenshots or Video

Demo of the bug:

CleanShot.2025-10-22.at.23.29.02.mp4

Version Information:

• WordPress 6.8.3
• PHP 8.2.27
• ACF PRO 6.6.1
• Browser (Chromium Engine Version 141.0.7390.108)

[mattgrshaw]

@FalkoJoseph Thanks for the report, we'll aim to get this fixed up in a future release.

[FalkoJoseph]

@FalkoJoseph Thanks for the report, we'll aim to get this fixed up in a future release.

Would be great! I love the direction ACF Blocks V3 is going towards! ACF + live preview is a superpower.

Any advice to avoid this bug for now, or is it a known issue/limitation within the current implementation?

Edit:

1. CMD+Z also doesn't seem to sync reliably.
2. I tested it with other input fields like (plain text) a little bit. It's primarily the wysiwyg that doesn't work.

Would love to know the cause of this issue.

Thanks!

[FalkoJoseph]

Update: for now I am using <InnerBlocks /> whenever possible, instead of the built-in tinymce editor. It seems more stable and quicker.