I forgot to mention the other SQL script required to fix the import.
Only the first post of each topic was displayed. A quick glance at the database and I saw that post_parent of each reply was set on the forum and not the topic.
So here we go :
UPDATE wp_posts m1
LEFT JOIN wp_postmeta m2 ON m1.ID = m2.post_id AND meta_key = '_bbp_topic_id'
LEFT JOIN wp_posts m3 ON m1.post_parent = m3.ID AND m3.post_type != 'forum'
SET m1.post_parent = m2.meta_key
WHERE m1.post_type = 'reply' AND m1.post_parent != m2.meta_value
I forgot to mention the other SQL script required to fix the import.
Only the first post of each topic was displayed. A quick glance at the database and I saw that post_parent of each reply was set on the forum and not the topic.
So here we go :
UPDATE wp_posts m1
LEFT JOIN wp_postmeta m2 ON m1.ID = m2.post_id AND meta_key = '_bbp_topic_id'
LEFT JOIN wp_posts m3 ON m1.post_parent = m3.ID AND m3.post_type != 'forum'
SET m1.post_parent = m2.meta_key
WHERE m1.post_type = 'reply' AND m1.post_parent != m2.meta_value