A URL in do_block_editor_incompatible_meta_box function does not have classic-editor__forget parameter

[tmatsuur]

If there is an incompatible meta box in the block editor, a link to switch to the classic editor will be displayed.
Clicking this link does not switch to the classic editor depending on the post data.

do_block_editor_incompatible_meta_box function(/wp-admin/includes/template.php)

$edit_url = add_query_arg( 'classic-editor', '', get_edit_post_link( $object ) );

In this part, I think that you need the classic-editorforget parameter as shown below.

$edit_url = add_query_arg( array( 'classic-editor'=>'', 'classic-editor__forget'=>'' ), get_edit_post_link( $object ) );

[mukesh27]

@tmatsuur that issue is already fixed in Classic Editor plugin ​https://wordpress.org/support/topic/switching-to-classic-editor-from-block-editor-doesnt-work/ but not resolve in core software.

[mukesh27]

Patch tested in WordPress Beta version 5.1-beta1-44558

[tmatsuur]

@mukesh27 thanks.

[pento]

In 45618:

Block Editor: Fix the link to the classic editor when incompatible meta boxen are detected.

Props tmatsuur, mukesh27.
Fixes #45935.

[JeffPaul]

Reopening this so it can be back-ported to the 5.2 branch, also needs testing to validate if this ticket is good to land in 5.2.3.

[SergeyBiryukov]

In 45848:

Block Editor: Fix the link to the classic editor when incompatible meta boxen are detected.

Props tmatsuur, mukesh27.
Merges [45618] to the 5.2 branch.
Fixes #45935.