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“Sorry, I found that the issue was in another plugin (Performance Lab).
In the line function webp_uploads_filter_image_editor_output_format( $output_format = null, $filename, $mime_type ) in the file /wp-content/plugins/performance-lab/modules/images/webp-uploads, I changed it to:
function webp_uploads_filter_image_editor_output_format( $output_format = null, $filename, $mime_type ) {
please close this support