Changing default F4 camera position disables module

I used to be able to edit views.lau to change the external F4 camera position. Now when I do so, it causes the aircraft module to disapear/deactivate from the game. I'm seeing this with the F-5E and someone else is reporting the same issue with the Viggen.

I can move the F4 camera via internal cockpit view key commands, but I can't get it to save as default F4 that way. Which method are we expected to use to save external view positions currently?

Edit: Saving external F4 camera position works fine in the Harrier (via editing views.lau in mods/aircraft/). So maybe the disappearing mod problem is specific to the F-5E.