I had this problem for the last couple of days, it was a CSS rule that put everything on the floor.
.myelement { background: black url("") center/cover no-repeat; }
Yes, you saw this little terrible mistake!
.myelement { background: black center/cover no-repeat; }
Just deleted the URL, and everything returned to normal for me.
It is strange that the SASS auto-compilation does not seem to be upset by this rule.
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