Thanks for reporting that.
I think this might affect more than glossary entries if it is happening in the HTML Purifier code.
I looked up the definition of the option CSS.AllowTricky...
...which is described as...
This parameter determines whether or not to allow "tricky" CSS properties and values. Tricky CSS properties/values can drastically modify page layout or be used for deceptive practices but do not directly constitute a security risk. For example, display:none; is considered a tricky property that will only be allowed if this directive is set to true.
I'm no expert on how the purifier works, but I think the impact of that change would need to be considered seriously.