[Block] Classic - Images with captions show [caption] html above and below image in editor

[cuemarie]

Quick summary

Images added via the Classic Block are showing caption html above and below the image when the image contains a visible caption.

Steps to reproduce

1. Create a new site
2. Open a post
3. Insert the Classic Block
4. Add media in the pop up modal for the classic block
5. Select/create an image that contains a caption
6. 👀 Observe how in the pop-up modal, the caption appears as expected
7. 👀 Save the edit to the classic content; now observe the [caption] html above and below the image

What you expected to happen

The caption to appear as it does in the pop-up modal

What actually happened

Above image:

Below image:

Impact

Some (< 50%)

Available workarounds?

There is no user impact - the live site does not show the [caption] html, so users don't need to implement a workaround to hide this on their sites.

Platform (Simple and/or Atomic)

Simple, Atomic

Logs or notes

Replicated on Simple and Atomic. Not able to reproduce outside of Dotcom.

Simple Test Site

• WP 6.3
• Gutenberg: v16.4.0
• Editing Toolkit: 3.75083
• WP AMP: 2.0.5

Atomic Test Sites

• WP 6.3
• Gutenberg: v16.4.0, v16.3.0, v16.2.1 (issue does not present with GB entirely deactivated)
• All plugins other than Gutenberg, Akismet, and Jetpack inactive

[cuemarie]

Found while testing https://github.com/Automattic/wp-calypso/issues/80347

[cuemarie]

📌 SCRUBBING : RESULT - Replicated / Could Not Replicate / Uncertain

• Tested on Simple – Replicated
• Tested on Atomic – Replicated
• Replicable outside of Dotcom – Yes

📌 FINDINGS/SCREENSHOTS/VIDEO

Screenshots/Recordings

Atomic

https://github.com/Automattic/wp-calypso/assets/27249804/5bbfcdd3-8c38-47a9-b6ba-8082277203dc

Self-Hosted

📌 ACTIONS

• Assigned to Non-Urgent
• Reported in Core: https://github.com/WordPress/gutenberg/issues/53698

[mrfoxtalbot]

I re-tested this and it is still reproducible.