Overly Zealous Shrink-Overflow

I'm trying to make a template (under the magic.mse-game file) with a vertical symbol-only text box, but I'm running into a weird issue with shrink-overflow. Specifically, it's shrinking even when it doesn't need to, which is mildly annoying.

Here's the code for the field:

casting cost 3:
left: 20
top: 75
height: 216
width: 50
alignment: top left shrink-overflow
direction: vertical
symbol font:
name: magic-mana-future
size: 25
scale down to: 12
always symbol: true
z index: 4
padding top: 0
padding bottom: 0Whenever I input a fifth symbol into the box, it begins shrinking them. Visually, this isn't necessary, and the math validates this:

I've also tried this with the magic-mana-large font, I've tried commenting out "scale down to", including a non-symbol font, and messing around with some alignment options, but none of it has helped. Does anyone have any suggestions on what's happening here and/or how I can fix it?

I can attach images of the effect it has if people would like to see it in action. It's a default field, as well, so it should be reproducible in any custom style file that doesn't already use casting cost 3.