**Possible iframe editor scrollbar/focus bug with ACF Blocks v3**
We are encountering what appears to be an iframe editor compatibility issue involving ACF Blocks v3 and editable ACF fields.
### Environment
– WordPress 6.9.4
– ACF Pro 6.8.0.1
– Custom ACF Blocks using:
– apiVersion: 3
– acf.blockVersion: 3
– Occurs across:
– Chrome
– Safari
– Firefox
– Reproduced on:
– macOS
– Windows
### Issue
When the block editor is running in iframe mode, clicking the editor scrollbar causes the page to jump downward unexpectedly.
This appears to happen because Gutenberg creates/focuses the trailing default paragraph block (“Type / to choose a block”) at the bottom of the editor.
The issue:
– occurs both when clicking the scrollbar thumb and scrollbar track
– is reasonably reproducible (happens most of the time)
– only seems to occur after interacting with an ACF block field
– occurs even with a simple plain text ACF field
– does not require WYSIWYG fields
– does not appear related to supports.mode
### Important observations
The issue only occurs:
– in iframe-enabled editor mode
– when the page contains an ACF block with editable fields
The issue does NOT occur:
– in non-iframe editor mode
– on pages without editable ACF block fields
### Additional notes
We tested removing:
“mode”: false
from block supports and the issue still occurred.
We also confirmed the issue with a minimal field setup using only a basic text field.
Example block configuration:
{
“apiVersion”: 3,
“acf”: {
“blockVersion”: 3,
“renderTemplate”: “tiles.php”
}
}
At this stage it appears to be related to focus/selection handling between:
– the iframe editor
– Gutenberg insertion point logic
– ACF editable block fields
rather than a specific field type or block configuration issue.
Has anyone else encountered this, or is this a known iframe compatibility issue?
