The addon MoveAnything seems to conflict with spell alerts which do not appear. Spell alerts are correctly displayed when MA is disabled.

Closing this issue as there haven’t been any news about this bug for months. Considering the popularity of MoveAnything, if the problem was really due to SpellActivationOverlay, there should have been more reports about this issue.

Feel free to comment about it if the issue still persists - and if someone is willing to give more information about it.