Steps to replicate the issue (include links if applicable):
- Block a user while another user is trying to block them
- They get two blocks instead of one
What happens?:
Translation: two blocks, one for 1 year and one for half a year, applied at the same time 12:45, 9 September 2025 by two different administrators.
What should have happened instead?:
Conflicting blocks should not be applied before warning a user. Administrators should get a warning to see if they still want to apply the block if another administrator already blocked the user with some other parameters.
Semi-related to T351511: How to deal with redundant block