[w3c/webcomponents] odd custom element placement (#869)

Here's my custom elements placed correctly:

http://51.38.51.120/issue/arrow.html

Here's my custom elements placed oddly:

http://51.38.51.120/issue/arrow_2.html

When the wrapped text is removed from the element, placement is correct:

http://51.38.51.120/issue/arrow_3.html

Can anyone explain this behaviour? 
Is it so that one should not wrap anything in a custom element if there's no slot for it?

Element source:

http://51.38.51.120/issue/custom-arrow.js

Element github: 

https://github.com/jutunen/custom-arrow

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https://github.com/w3c/webcomponents/issues/869