Front-end article editor submissions fails with reCaptcha v2

reCaptcha v2 is not working for front-end article edit submission. When the save button is pressed the error response is "Invalid field: Captcha" and it returns to the same editor page (with the edits).


Here's the site configuration:



If I instead set mode to code (internal), the above editor submission works correctly.

Any idea what's up with reCaptcha please?

Joomla! 5.2.3 Stable [ Uthabiti ] 7-January-2025 16:00 GMT
Kunena: 6.3.8 2024-12-29
CB: 2.9.3+build.2025.01.09.19.37.00.f3e4e0439
CB Antispam: 6.1.0
JCE: 2.9.82

Same problem in groups when sending a private message.