WordPress 5.8, Plugins put in: Superior Editor Instruments (Gutenburg turned off), WPBakery Web page Builder, the theme for Lore KB (all plugins put in besides LSVR FAQ and Envato Market). Theme is Lore-Little one (a part of the Lore KB).
If I’m going to Information Base and add article, the traditional editor begins and if I take advantage of "Preview" button, it really works effective each time. If I then publish the article, return in to it by way of Edit Article and click on Preview Modifications it is going to come up 404 web page not discovered, if I shut that web page, then click on Preview Modifications once more, it really works, if I shut that web page and click on Preview Modifications once more it goes again to 404 web page not discovered, the following time, it really works once more, repeat again and again.
Articles I imported (they use a post_type of ‘lsvr_kba’ ) all simply do 404 web page not discovered when Preview Modifications is clicked however in any other case all work effective.
The permalinks look appropriate, no particular gadgets in .htaccess.
Any concepts?
UPDATE: If I allow Gutenberg and use native block editor the preview works. So one thing with the traditional editor?