Warning messages appear in UI the Appearance Editor when we activate Gutenberg

[amitbhosale]

Got one Warning message in the Twenty Twenty-Five theme while opening in Appearance>Editor
I've activated Gutenberg Plugin and got the above error
WordPress Version - 6.8.1
PHP Version - 8.2
WordPress Studio

Screenshot :

Warning:  Cannot modify header information - headers already sent by (output started at /.../wp-content/plugins/gutenberg/lib/compat/wordpress-6.8/site-editor.php:30) in /.../wp-includes/functions.php
2:31
Warning:  Cannot modify header information - headers already sent by (output started at /.../wp-content/plugins/gutenberg/lib/compat/wordpress-6.8.1/site-editor.php:30) in /.../wp-includes/functions.php
Warning:  Cannot modify header information - headers already sent by (output started at /.../wp-content/plugins/gutenberg/lib/compat/wordpress-6.8/site-editor.php:30) in /.../wp-admin/admin-header.php

[jorbin]

Hi @amitbhosale, welcome to WordPress Core Trac.

Since you are only seeing this error with the Gutenberg plugin active, it's something that is best reported to ​the Gutenberg repository.

Once you do that, you can come back here and close this with the status reported-upstream

[amitbhosale]

Replying to jorbin:

Hi @amitbhosale, welcome to WordPress Core Trac.

Since you are only seeing this error with the Gutenberg plugin active, it's something that is best reported to ​the Gutenberg repository.

Once you do that, you can come back here and close this with the status reported-upstream

OK sure, Let me update accordingly.

[sabernhardt]

Thanks for moving the report!

​https://github.com/WordPress/gutenberg/issues/70060