1.13 : spell magic stone icon looks "unusable"

Hi,
The spell (cleric/bishop etc.) "magic stone" is an icon which is a bit dark/greyed.
It looks like the "unusable" version of other spells, even if it is used.
Could the "normal" (usable) icon of this spell be lightened, so that we do not think at first glance that the spell is unusable?
The spell (cleric/bishop etc.) "magic stone" is an icon which is a bit dark/greyed.
It looks like the "unusable" version of other spells, even if it is used.
Could the "normal" (usable) icon of this spell be lightened, so that we do not think at first glance that the spell is unusable?