ScriptUtils.executeSqlScript throws "connection is closed" after spring boot upgrade - spring-data-r2dbc

Question

I was updating spring boot from 2.5.1 to 2.7 together with the r2dbc and postgres dependencies. I did no change the application.yml or test setup. Before the update my repository tests run fine with testcontainers, but now I see this exception which is thrown by a #AfterEach that tries to clean the DB:
2022-05-29 10:04:52.447 INFO 16673 --- [tainers-r2dbc-0] 🐳 [postgres:13.2] : Container postgres:13.2 started in PT1.244757S
Failed to execute SQL script statement #1 of InputStream resource [resource loaded through InputStream]: DROP SCHEMA public CASCADE; nested exception is io.r2dbc.postgresql.client.ReactorNettyClient$PostgresConnectionClosedException: Cannot exchange messages because the connection is closed
org.springframework.r2dbc.connection.init.ScriptStatementFailedException: Failed to execute SQL script statement #1 of InputStream resource [resource loaded through InputStream]: DROP SCHEMA public CASCADE; nested exception is io.r2dbc.postgresql.client.ReactorNettyClient$PostgresConnectionClosedException: Cannot exchange messages because the connection is closed
at org.springframework.r2dbc.connection.init.ScriptUtils.lambda$runStatement$9(ScriptUtils.java:571)
This is my abstract RepositoryTest:
#DataR2dbcTest
#ActiveProfiles("test")
internal abstract class RepositoryTest {
#Autowired
protected lateinit var connectionFactory: ConnectionFactory
#AfterEach
fun clean() {
runSql(
"""
DROP SCHEMA public CASCADE;
CREATE SCHEMA public;
"""
)
}
protected fun runSql(sql: String) {
runScript(InputStreamResource(sql.byteInputStream()))
}
protected fun runScript(sqlScript: Resource) {
runBlocking {
val connection = connectionFactory.create().awaitFirst()
ScriptUtils.executeSqlScript(connection, sqlScript)
.block() // <---- throws the said exception, but it worked before the update.
}
}
}
My actual test looks like this:
internal class MyRepoTest : RepositoryTest() {
#Autowired
private lateinit var myRepo: MyRepository
#Test
fun someTest() {
val userId = 3429L
val myEntities = ...
runBlocking { myRepo.saveAll(myEntities).collect() }
val result = myRepo.findAllByUserId(userId).asFlux()
StepVerifier.create(result)
.expectNextMatches { it.userId == userId}
.expectNextMatches { it.userId == userId}
.verifyComplete()
}
}
I guess the way I try to execute the SQL commands is not fine, how should I do it?
val connection = connectionFactory.create().awaitFirst()
ScriptUtils.executeSqlScript(connection, sqlScript)
.block() // <---- throws the said exception, but it worked before the update.
EDIT
I figured out that using ResourceDatabasePopulator works fine:
7protected fun runScript(sqlScript: Resource) {
runBlocking {
ResourceDatabasePopulator(sqlScript).populate(connectionFactory).block()
}
}
But I still would like to understand why the original implementation now fails.