Electric Fences used to be buggy all the time in previous alphas, but in this alpha 20, they went a dimension further up. See in this video at the linked timestamp:
1. dimension:
Expected behavior: When repairing, fence wires always get tightened
Experienced behavior: When repairing, fence wires sometimes get redirected into nirwana (indefinitely in a vicinity, and working at that wrong placement along the wire)
2. dimension:
Expected behavior: As long as not damaged, wires should work and thus damage incoming zombies
Experienced behavior: During horde night, wires suddenly stop working all at ones, while being damaged only to a certain portion of all wires (During repair, it is shown that only a portion of the wire receivers...