"To Do" icon problem

Found an issue where it appears the “To Do” icons don’t translate between the Mac (3.1.5) and the Windows Beta ( versions. A document assigned either the “To Do - Checked” or “To Do - Unchecked” icon when saved on one version will revert to the basic document icon when opened on the other. It happens both directions (Mac>Windows Beta and Windows Beta>Mac). All other icons seem to function fine, including those based on emojis.