In T114542#1723679, @dr0ptp4kt wrote:

@Qgil, when I click the "Save Blocked By Tasks" button while trying to make this task a blocking task inside of T111588 and T111588 (i.e., after I have clicked the "Select" button), on both of those pages it just sits there with a tinted UI. Are you able to use your Phabricator super powers to make T114542 block each of T111588 and T111588?

I did manage to make it a task blocking 1723663 without getting stuck on the tinted screen.

I can reproduce this problem:

1. Go to T111588
2. Click "Edit 'Blocked By' tasks"
3. Select T111588
4. The dialog disappears leaving a tinted screen. No error message. No task blocked by.

@dr0ptp4kt, please edit the description to fix two mistakes that limit the possibility to test this problem: "T111588 and T111588" and "1723663". Thank you!