MorphL2: Delegators can lose their rewards when a delegator has removed a delegatee and claims all of his rewards before delegating again to a previous removed delegatee.

MorphL2's Distribute reward contract contains two interacting faults that let a delegator lose earned staking rewards permanently, even when following the intended flow. The first is in claimAll, which iterates over the delegatees EnumerableSet while _claim re …