edit-block query does not contain a where clause

The block-edit page does not correctly select the clicked block; rather, it retrieves all blocks (the query in the network inspector is simply .../manualblocks; there is no ?query clause whatsoever.

Steps to reproduce

1. create a block for any user. Enter "AAA" in the "Block description"
2. create a second block for the same user. Enter "BBB" in the "Block description"
3. click the "BBB" row to edit it

Expected outcome

1. edit-block pane contains the "BBB" details
2. You should be able to close the edit pane with the X in the upper left

Actual outcome

1. edit-block pane contains the "AAA" details OR details that pertain to neither (maybe it's showing the patron block from a totally different user?)
2. You can't close the edit pane with the X in the upper left

Alternative repro steps

1. create a block for user-a with "AAA" in the description
2. create a block for user-b with "BBB" in the description
3. edit block for user-b; it will contain "AAA"