Case Number search input should not automatically move my cursor

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When editing the case number search input field on the Case Search screen, I can move my cursor to a position within the year portion of the field and type either a number or a backspace/delete, and whatever the result of the keystroke is, my cursor is then moved to the end of the input.

To replicate:

Type 24-56789
Move cursor to between 2 and 4
Press the backspace key
Note that the 2 is removed and the cursor is now after the 9
Move cursor to between 5 and -
Press the delete key
Note that nothing changes other than the cursor position which is once again after the 9
Move cursor to between 6 and 7
Type 1
Note that the 1 is inserted and the cursor remains where it should
Move cursor to before 4
Press the delete key
Note that the 4 is removed and the cursor is returned to after the 9
Move the cursor to between the 6 and -
Type 2
Note that the 2 is inserted and the cursor is moved to after the 9
Move the cursor to between the - and 2
Type 3
Note that the 3 is inserted and the cursor is moved to after the 9 Note: it seems that if all available characters are filled, or the cursor is in front of the -, the cursor ends up moving to the end.