Embeding in Moodle Grid format

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H5P potentially has a bug with the grid format/Boost theme (any browser) in Moodle (3.7+) [with latest H5P plugin update installed] when you embed an H5P activity created from H5P online account.

For example, if you refresh the page, wait five seconds then click into the Moodle Grid section that contains the embedded H5P, the activity doesn't render. However, if you refresh the page and immediately click on the grid section it renders correctly. When it doesn't render, the H5P content iframe is loaded onto the page with content, but it has set its height to zero pixels. I don't know if this is a problem with the Moodle grid course format, the H5P plugin, or is a symptom of how the two interact. (see screen shot)

Second issue - if you try and upload the H5P file into the Moodle H5P activity tool it says it has loaded correctly but then just gets stuck (screen shot attached).

So there is no way to get the H5P into Moodle and working correctly - would appreciate some advice please.