If you set your residence flag explosions to false, you will find that if an explosion happens nearby your item frames, all of them within a proximity of the explosion will drop their contents, yet the frame itself will remain untouched. I have also tried setting itemframe to false, as well as build. Neither of these prevent this bug from occurring, which leads me to believe it is just an unimplemented feature.
If you set your residence flag
explosionsto false, you will find that if an explosion happens nearby your item frames, all of them within a proximity of the explosion will drop their contents, yet the frame itself will remain untouched. I have also tried settingitemframeto false, as well asbuild. Neither of these prevent this bug from occurring, which leads me to believe it is just an unimplemented feature.