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The latest version of Sigil is 7.4. You might try that version and see how many of these bugs go away.
Sigil is an epub2 editor, it does not use epub3 constructs and in the old version you are running, it actually removes some, including video embedding, because that is not an epub2 function. In the 7.4 version, at least you can put it in by hand and the program won't remove it, but it is not intended to display it.
There are not going to be further bug fixes for Sigil as development as stopped on it due to lack of people to keep it up, it being written in a version of C, which is a good professional programming language, but not very common among casual programmers.
Calibre's developer is adding an editor to his program, but it is currently at a basic stage. He is adding features very fast, but it took years to get Sigil where it is, so it will take at least months or maybe a year to get it to where Sigil is now. Being written in Python, it will have more developers available and it will not be tied to epub2.
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