Sorry, to clarify….
The original poster stated above that “This was an conflict with the Jetpack Boost “optimize critical CSS” option.”
Is your problem different than theirs?
Hi and thanks very much for the follow up!
This plugin has recently changed ownership and we hadn’t seen this. Sounds like a plugin conflict. Give us a couple days to try to duplicate and troubleshoot. We’ll see if we can find a solution on our side, or if not, see if we can suggest something to the Jetpack team.