After updating from panels 3.5 -> Panels 3.6 today, I noticed that any underscores in pane CSS IDs are being converted to hyphens. We have a number of sites where our themes target these CSS IDs for styling, so the themes have broken. Is this expected behavior for the upgrade (theres nothing in the UPGRADE.txt about it)?
To be clear about the CSS ID's I'm talking about, I took a couple screenshots to demonstrate where I'm editing this CSS ID. When the page renders, the actual ID has hyphens in it instead of underscores.