Defaulted boolean fields can get into a weird focus-absorbing selected state

[nwinter]

If I have a defaulted boolean Treema like either of these:

If I click on the key (exists) to select it:

Then press tab (which will also happen whenever tabbing through fields and hitting a defaulted boolean value), I get into this weird state:

Now pressing tab (or anything other than enter, t, or f) will have no effect. Also, I can't get rid of that state by clicking anywhere except the value (not even the key or another Treema). It also continues to absorb keypresses. For example, I can't type a commit message in here because that state is still absorbing all focus: