Changing Metadata Clears Canvas AI Prompt Text [#3558257]

Overview

When composing a prompt in Canvas AI, if any page metadata (such as meta description) is modified before submitting the prompt, all previously entered text in the Canvas AI prompt field is erased.

Proposed resolution

Updating any metadata field (title, description, etc.) should not clear the text entered in the Canvas AI prompt field.
The data in the Canvas AI prompt and in the metadata fields should be managed independently without interference from one another.

Steps to Reproduce (Refer attached video)

Open a page using Canvas AI.
Enter text in the page meta description
Enter a prompt in the Canvas AI prompt field on the canvas but do not hit the "up arrow" icon yet.
Change the metadata text by modifying description again.
Observe that all the text previously entered in the Canvas AI prompt field disappears.

Comment	File	Size	Author
	Canvas AI input disappear.mov	17.2 MB	vipin.mittal18

Issue fork canvas-3558257

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3558257-changing-metadata-clears changes, plain diff MR !530
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Comments

Comment #1

17 November 2025 at 13:22

vipin.mittal18 created an issue. See original summary.

Comment #2

2 February 2026 at 20:40

scott falconer made their first commit to this issue’s fork.

Comment #3

2 February 2026 at 22:28

scott falconer opened merge request !530

Comment #4

scott falconer commented 2 February 2026 at 22:32

Status:

Active

» Needs review

Overview

While composing a prompt in the Canvas AI sidebar, changing page metadata (for example, meta description) clears the in-progress prompt text.

Steps to reproduce

1) Open a Canvas page with Canvas AI enabled.

2) Enter a meta description.

3) Type a prompt in the Canvas AI prompt field, but do not submit.

4) Change the meta description again.

Expected

The prompt text remains intact after metadata edits.

Actual

The prompt text is cleared after metadata edits.

Proposed resolution

Preserve prompt input across metadata updates by stabilizing DeepChat props and restoring the prompt content if the input is reset.

User interface changes

None.

Tests

ddev phpcs (pass)

ddev phpunit web/modules/custom/canvas_3558257/tests/src/Functional/BlockComponentFormTest.php (fail: expected size 0, got 1; matches issue 3570699)

ddev exec drush ev '\Drupal::currentUser()->setAccount(\Drupal\user\Entity\User::load(1)); $h=\Drupal::service("canvas_ai.page_builder_helper"); print $h->getComponentContextForAi();' (output missing block props use_site_logo/use_site_name/use_site_slogan; likely related to issue 3569120)

Intent testing via compare_runs: baseline prompt cleared, modified prompt preserved (artifacts in .intent_artifacts/issue_3558257/)