Cursor jumps to the end of the field when editing plates.

When changing/inserting a character in a plate, after I type a single character, the cursor jumps to the end of the string.

Example:

A|123

I want to correct this to ABC123. I type B and would expect:

AB|123

But instead the cursor jumps to the end:

AB123|

If I'm not paying attention, the next character C ends up in the wrong place at the end of the string.

AB123C|