Lazyload YouTube two issues

When I use replace thumbnail image with lazy load I have two issues:

1) If I paste de youtube video url as html then it is correctly converted to embeded video but whetever I write after the video it appears stuck (without vertical space) between video and text.

2) If I use new wordpress editor to paste video the vertical space works fine but there is a problem cause the thumbnail appears just in half of video bottom half of embeded video is black.