test_async_load_databases is flaky

[azat]

cidb - https://play.clickhouse.com/play?user=play#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

File: test_async_load_databases/test.py:336 - in test_materialized_views_cascaded_multiple
    assert query("select * from test_mv.z Format CSV") == "42,2\n"
E   AssertionError: assert '42,0\n' == '42,2\n'
E     
E     - 42,2
E     ?    ^
E     + 42,0
E     ?    ^

E   helpers.client.QueryRuntimeException: Client failed! Return code: 82, stderr: Received exception from server (version 25.10.1):
E   Code: 82. DB::Exception: Received from 172.16.2.6:9000. DB::Exception: Database test_mv already exists.. Stack trace:

[antaljanosbenjamin]

Yeah, just started to figure this out, probably some issues with dependencies.

[azat]

@antaljanosbenjamin yes - #88573

[antaljanosbenjamin]

Ahh, then we both ended up with the same solution 😄