@revixi5 fixed now in today’s update!
Oh I wasn’t expecting such a fast response with an update. Unfortunately it didn’t solve the issue on my side… My problem is with the block of CSS generated by a plugin (or by WordPress). Here it is if it can help to pin point the issue.
<style id="boldblocks-youtube-block-style-inline-css">
.wp-block-boldblocks-youtube-block .visually-hidden{height:1px;overflow:hidden;position:absolute;white-space:nowrap;width:1px;clip:rect(0 0 0 0);clip-path:inset(50%)}.wp-block-boldblocks-youtube-block .yb-player{background-color:#000;background-position:50%;background-size:cover;contain:content;cursor:pointer;display:block;position:relative}.wp-block-boldblocks-youtube-block .yb-player:after{content:"";display:block;padding-bottom:var(--byeb--aspect-ratio,56.25%)}.wp-block-boldblocks-youtube-block .yb-player>iframe{border:0;height:100%;left:0;position:absolute;top:0;width:100%;z-index:1}.wp-block-boldblocks-youtube-block .yb-player.is-activated{cursor:unset}.wp-block-boldblocks-youtube-block .yb-player.is-activated>.yb-btn-play{display:none;opacity:0;pointer-events:none}.wp-block-boldblocks-youtube-block .yb-btn-play{all:unset;background-color:transparent;background-image:url("data:image/svg+xml;utf8,<svg xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"0 0 68 48\"><path d=\"M66.52 7.74c-.78-2.93-2.49-5.41-5.42-6.19C55.79.13 34 0 34 0S12.21.13 6.9 1.55c-2.93.78-4.63 3.26-5.42 6.19C.06 13.05 0 24 0 24s.06 10.95 1.48 16.26c.78 2.93 2.49 5.41 5.42 6.19C12.21 47.87 34 48 34 48s21.79-.13 27.1-1.55c2.93-.78 4.64-3.26 5.42-6.19C67.94 34.95 68 24 68 24s-.06-10.95-1.48-16.26z\" fill=\"red\"/><path d=\"M45 24 27 14v20\" fill=\"white\"/>");border:none;cursor:pointer;display:block;filter:grayscale(100%);height:48px;left:50%;margin:0;position:absolute;top:50%;transform:translate3d(-50%,-50%,0);transition:filter .1s cubic-bezier(0,0,.2,1);width:68px;z-index:1}.wp-block-boldblocks-youtube-block .yb-btn-play:focus,.wp-block-boldblocks-youtube-block .yb-player:hover>.yb-btn-play{filter:none}.wp-block-boldblocks-youtube-block figcaption{margin-bottom:1em;margin-top:.5em}
/*# sourceURL=./wp-content/plugins/better-youtube-embed-block/build/style-index.css */
</style>
And the original CSS generated by WordPress without Simply Static export :
<style id='boldblocks-youtube-block-style-inline-css'>
.wp-block-boldblocks-youtube-block .visually-hidden{height:1px;overflow:hidden;position:absolute;white-space:nowrap;width:1px;clip:rect(0 0 0 0);clip-path:inset(50%)}.wp-block-boldblocks-youtube-block .yb-player{background-color:#000;background-position:50%;background-size:cover;contain:content;cursor:pointer;display:block;position:relative}.wp-block-boldblocks-youtube-block .yb-player:after{content:"";display:block;padding-bottom:var(--byeb--aspect-ratio,56.25%)}.wp-block-boldblocks-youtube-block .yb-player>iframe{border:0;height:100%;left:0;position:absolute;top:0;width:100%;z-index:1}.wp-block-boldblocks-youtube-block .yb-player.is-activated{cursor:unset}.wp-block-boldblocks-youtube-block .yb-player.is-activated>.yb-btn-play{display:none;opacity:0;pointer-events:none}.wp-block-boldblocks-youtube-block .yb-btn-play{all:unset;background-color:transparent;background-image:url("data:image/svg+xml;utf8,<svg xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"0 0 68 48\"><path d=\"M66.52 7.74c-.78-2.93-2.49-5.41-5.42-6.19C55.79.13 34 0 34 0S12.21.13 6.9 1.55c-2.93.78-4.63 3.26-5.42 6.19C.06 13.05 0 24 0 24s.06 10.95 1.48 16.26c.78 2.93 2.49 5.41 5.42 6.19C12.21 47.87 34 48 34 48s21.79-.13 27.1-1.55c2.93-.78 4.64-3.26 5.42-6.19C67.94 34.95 68 24 68 24s-.06-10.95-1.48-16.26z\" fill=\"red\"/><path d=\"M45 24 27 14v20\" fill=\"white\"/></svg>");border:none;cursor:pointer;display:block;filter:grayscale(100%);height:48px;left:50%;margin:0;position:absolute;top:50%;transform:translate3d(-50%,-50%,0);transition:filter .1s cubic-bezier(0,0,.2,1);width:68px;z-index:1}.wp-block-boldblocks-youtube-block .yb-btn-play:focus,.wp-block-boldblocks-youtube-block .yb-player:hover>.yb-btn-play{filter:none}.wp-block-boldblocks-youtube-block figcaption{margin-bottom:1em;margin-top:.5em}
/*# sourceURL=http://host-2:8888/wp-content/plugins/better-youtube-embed-block/build/style-index.css */
</style>
@revixi5 Try again now with 3.6.8 – looks like I’ve missed parts of the SVG problem on the last version, but it should handle both cases now!
Fantastic! Everything works flawlessly now. Thanks a lot for this improvement it will save me a lot of work.