Global Colors keep getting converted to unreadable values once page is saved.

Running GeneratePress 3.1.3 + GP Premium 2.1.2 on a multi-site, and am having a maddening problem with global colors. Whenever I (block mode) edit a page and assign a global color, it looks great until the next time I enter the (block mode) editor and re-save. At that point, the value in the color field changes from the proper readable meaningful value, i.e.:

var(--contrast-4)

to a nonsense value making the assigned color fail to apply, i.e.:

var(u002du002dcontrast-4) (same color, but with the hex code dashes becoming written-out alphanumeric strings)

Have you seen this before? Is it fixable? Help!

:Benjamin