Panic during block production: InsufficientFunds

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A performance degradation was observed in the testnet after the spammer was started.
Block production /push times were high:

Also, validator 2 exhibited a behavior where from a certain point in time, it started accumulating all transactions in the mempool without removing any, which caused the mempool to get to its maximum capacity.

After dumping logs, the following panic was observed in validator 2:

ERROR panic | thread 'tokio-runtime-worker' panicked at 'Failed to compute accounts hash during block production: InsufficientFunds { needed: Coin(2), balance: Coin(0) }': blockchain/src/block_production/mod.rs:133 0: <backtrace::capture::Backtrace as core::default::Default>::default 1: log_panics::Config::install_panic_hook::{{closure}} 2: std::panicking::rust_panic_with_hook 3: std::panicking::begin_panic_handler::{{closure}} 4: std::sys_common::backtrace::__rust_end_short_backtrace 5: rust_begin_unwind 6: core::panicking::panic_fmt 7: core::result::unwrap_failed 8: nimiq_blockchain::block_production::BlockProducer::next_micro_block 9: nimiq_validator::micro::NextProduceMicroBlockEvent<TValidatorNetwork>::next::{{closure}} 10: <nimiq_validator::validator::Validator<TValidatorNetwork> as core::future::future::Future>::poll 11: <tokio_metrics::task::Instrumented<T> as core::future::future::Future>::poll 12: tokio::runtime::task::core::Core<T,S>::poll 13: tokio::runtime::task::harness::Harness<T,S>::poll 14: tokio::runtime::scheduler::multi_thread::worker::Context::run_task 15: tokio::runtime::scheduler::multi_thread::worker::Context::run 16: tokio::runtime::context::set_scheduler 17: tokio::runtime::context::runtime::enter_runtime 18: tokio::runtime::scheduler::multi_thread::worker::run 19: <tokio::runtime::blocking::task::BlockingTask<T> as core::future::future::Future>::poll 20: tokio::runtime::task::core::Core<T,S>::poll 21: tokio::runtime::task::harness::Harness<T,S>::poll 22: std::sys_common::backtrace::__rust_begin_short_backtrace 23: core::ops::function::FnOnce::call_once{{vtable.shim}} 24: std::sys::pal::unix::thread::Thread::new::thread_start 25: <unknown> 26: <unknown>

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pubtestnet_validator2.log

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