ClickHouse version is 20.3.8.53

CREATE TABLE local.a ( t DateTime, tm Date MATERIALIZED toDate(t) ) ENGINE = ReplicatedMergeTree() ;

CREATE TABLE write.a ( t DateTime, tm Date ) ENGINE = Distributed(cluster, local, a);

I send inserts in the table write.a with both field t and tm and now data hangs. ClickHouse trying to send it to the table local.a, but field tm rises error Cannot insert column tm, because it is MATERIALIZED column.
I try system queries STOP DISTRIBUTED SENDS write.a, but its doesn't work for me - I need to delete this queries.
Trying to reboot ClickHouse - does not work.
Has anyone got any ideas how to fix it?
Thanks in advance.