We've fixed this now, but it won't be retroactive if you installed the beta already as it involves changing the definition of the default like reaction. On the plus side, it's a trivial change for you. Just change the color associated with like to @xf-linkColor
via the control panel.
There is also a related change where we won't apply the reaction color in the action bar area unless the reaction has been applied. So if you kept blue explicitly, the link would only be that color on posts you liked (similar to as if you applied a different reaction).