Below is what I am seeing a lot in relation to errors from my site error logs. I wanted to report this. I see others have mentioned video issues as well. Same issue still present on 13 B1. **Update 5/28/22: With some time to dig, The video poster error is literally what the issue is, it is the video posters. When you upload a video poster for the video it does not show, it will if your put it in the post itself though. Wonder if it is something to do with storage possibly. Unsure, but definitely not showing uploaded poster images. It does upload just it does not show as poster when selected**

 $aTmplVarsVideos[] = array(
                        'style_prefix' => $sStylePrefix,
                        'class' => '',
                        'item' => $this->parseHtmlByContent($sAttachTmpl, array(
                            'style_prefix' => $sStylePrefix,
                            'bx_if:show_link' => array(
                                'condition' => $bUrl,
                                'content' => array(
                                    'style_prefix' => $sStylePrefix,
                                    'url' => $sUrl,
                                    'src' => $aVideo['src_poster'],
                                )
                            ),
                            'bx_if:show_non_link' => array(
                                'condition' => !$bUrl,
                                'content' => array(
                                    'style_prefix' => $sStylePrefix,                                    'src' => $aVideo['src_poster'],                                )                            ), 

Here are three different users same error 1 minute after the other:

39817#0: *12928 FastCGI sent in stderr: "PHP message: PHP Warning: Undefined array key "src_poster" in /var/www/vhosts/-----/httpdocs/modules/boonex/timeline/classes/BxTimelineTemplate.php on line 2772PHP message: PHP Warning: Undefined array key "src_poster" in /var/www/vhosts/-----/httpdocs/modules/boonex/timeline/classes/BxTimelineTemplate.php on line 2779" while reading response header from upstream