I seem to only be getting these in Edge if that helps anyone.
EDIT; nevermind, the files still don't load, but the errors don't show in chrome, just in the edge console. They also don't show in event log either.
EDIT # 2: They also don't show for me in the dancing goat installation.
EDIT # 3: and now they are not showing again.... weird
EDIT # 4: i think it is related to the issue here https://devnet.kentico.com/questions/page-builder-error