This craft causes the variable setters to stop working, when the spring is broken.
Select a target and observe, that the top displayed value is its altitude (your own altitude, when no target is selected). You then activate AG 1, to drop the weight and break the spring. When you hear a distinct snapping sound, you are successful and can observe that all the variable setters are stuck at their last assigned value
Your spring was to blame, more detail in your bug replicator build.
Short answer: not necessarily @Gestour. Long answer: I discovered this bug while changing the wings of this plane. With more bend-y wings, this plane would stall easily at high speeds, putting a lot of tension on the stabiliser spring, which would break. When trying to recover from those stalls I found the variable controlled rudder unresponsive, and all other variable setter controlled gauges/displays would be stuck where they where, when the spring broke (distinct snapping sound). Since the rudder was unresponsive/stuck in position and the top horizontal stabiliser didn’t have a force to return it to neutral, instead aligning with the angle of attack, the stall would be nearly unrecoverable. I then rigged up a tester, to reproduce the bug, which didn’t work. The difference to the linked craft is, that it didn’t have the detacher (maybe the body where the spring is attached to, has to have a second non-rigid joint).
Does the broken spring critically damage your craft?