Not single use but this type of shouldered bolt, seal, gasket for cam covers arrangement has been around for a very long time and works fine when new, soft gasket and seals are used then the bolts NEED NOT BE THAT TIGHT to seal.
When squashed and hardened gasket and seals are reused the odds of a broken bolt increase dramatically because you don't FEEL the soft seals and gasket seat (give?).
If I were the OP I'd get all new bolts, seals, and a new gasket then choke way up on the wrench when tightening.