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H5P activity module (third party) breaks Boost theme

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H5P activity module (third party) breaks Boost theme

I have a fresh local install of Moodle 3.3. When I try to install the H5P activity module (, I lose all my CSS styling. 

I am assuming that this is related to the way that CSS is generated from dynamic style sheets in the Boost theme. When I switch to a new theme and purge caches, it works again. I can also turn on theme developer mode and then it will work with Boost.

After the CSS failed to load initially, I also found that pages weren't loading at all (timing out after 300 seconds) so had to purge caches via CLI.

Has anyone else had this issue?

I guess there muse be some styling in H5P that doesn't parse correctly.

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