Fix auto-pause xcm: incoming XCMP messages where dropped when auto-pause #12487

Job	Run time
set-tags	5s
Check with Prettier	24s
check-copyright	4s
Check Cargo.toml files format	7s
Check editorconfig	7s
Check with EsLint	29s
check-links	44s
Check with rustfmt	13s
build	9m 38s
cargo-clippy	6m 42s
Check 'forbid-evm-reentrancy'	13s
rust-test	16m 36s
Check WASM runtimes with Twiggy	2m 51s
chopsticks-upgrade-test (moonbase)	52s
zombie_upgrade_test (moonbase)	8m 36s
chopsticks-upgrade-test (moonriver)	51s
dev-test (moonbase, 1)	2m 34s
zombie_upgrade_test (moonbeam)	8m 41s
docker-moonbeam	43s
chopsticks-upgrade-test (moonbeam)	50s
dev-test (moonbase, 2)	2m 32s
dev-test (moonbase, 3)	2m 22s
dev-test (moonbase, 4)	2m 38s
typescript-tracing-tests	9m 23s
dev-test (moonriver, 1)	1m 42s
dev-test (moonriver, 2)	1m 42s
dev-test (moonriver, 3)	1m 46s
dev-test (moonriver, 4)	1m 35s
dev-test (moonbeam, 1)	1m 43s
dev-test (moonbeam, 2)	1m 48s
dev-test (moonbeam, 3)	1m 46s
dev-test (moonbeam, 4)	1m 41s
	1h 31m 58s

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