In Mysteries of Westgate, I cannot scribe scroll of Ethereal Jaunt. As soon as I click the icon of Ethereal Jaunt, my wizard starts casting the spell on himself without letting me choose a target.

But I could scribe scrolls of Ethereal Jaunt in Storm of Zehir. It looks like the two games behave differently in this respect.

I informed Ossian Studios of this issue and they replied saying something like it appears to be a 2DA issue for that spell and it's possible that GOG made an error when merging things together. They are unable to fix it due to the GOG version being custom-made by GOG.