Ignore unknown block root events for processing blocks #16323

Job	Run time
beacon-chain-tests	16m 1s
op-pool-tests	21m 33s
release-tests-ubuntu	20m 26s
release-tests-windows	13m 9s
target-branch-check	2s
network-tests	17m 51s
slasher-tests	5m 29s
state-transition-vectors-ubuntu	11m 31s
basic-simulator-ubuntu	22m 41s
debug-tests-ubuntu	10m 37s
dockerfile-ubuntu	14m 5s
doppelganger-protection-test	22m 37s
ef-tests-ubuntu	12m 6s
execution-engine-integration-ubuntu	11m 57s
fallback-simulator-ubuntu	21m 14s
check-code	10m 13s
check-msrv	4m 14s
cargo-udeps	6m 18s
cli-check	18m 1s
compile-with-beta-compiler	13m 51s
test-suite-success	0s
	4h 33m 56s

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