Process start but jobs never run and remain in [ACT_RU_JOB] table

[vdeygas]

Describe the bug
Process start, event PROCESS_START is revceived.
Jobs remain in the [ACT_RU_JOB] table and are not executed.
A call to Rest endpoint /service/management/jobs shows all this jobs.

A thread dump highlights 5 runnable threads with potential deadlock :

"task-865" #1593 prio=5 os_prio=0 cpu=0.61ms elapsed=64012.60s tid=0x00007fbc584176a0 nid=0x680 runnable [0x00007fbc56d70000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.Net.poll(java.base@17.0.8.1/Native Method) at sun.nio.ch.NioSocketImpl.park(java.base@17.0.8.1/Unknown Source) at sun.nio.ch.NioSocketImpl.park(java.base@17.0.8.1/Unknown Source) at sun.nio.ch.NioSocketImpl.implRead(java.base@17.0.8.1/Unknown Source) at sun.nio.ch.NioSocketImpl.read(java.base@17.0.8.1/Unknown Source) at sun.nio.ch.NioSocketImpl$1.read(java.base@17.0.8.1/Unknown Source) at java.net.Socket$SocketInputStream.read(java.base@17.0.8.1/Unknown Source) at org.postgresql.core.VisibleBufferedInputStream.readMore(VisibleBufferedInputStream.java:161) at org.postgresql.core.VisibleBufferedInputStream.ensureBytes(VisibleBufferedInputStream.java:128) at org.postgresql.core.VisibleBufferedInputStream.ensureBytes(VisibleBufferedInputStream.java:113) at org.postgresql.core.VisibleBufferedInputStream.read(VisibleBufferedInputStream.java:73) at org.postgresql.core.PGStream.receiveChar(PGStream.java:453) at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2119) at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:355) - locked <merged>(a org.postgresql.core.v3.QueryExecutorImpl) at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:490) at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:408) at org.postgresql.jdbc.PgPreparedStatement.executeWithFlags(PgPreparedStatement.java:167) at org.postgresql.jdbc.PgPreparedStatement.execute(PgPreparedStatement.java:156) at com.zaxxer.hikari.pool.ProxyPreparedStatement.execute(ProxyPreparedStatement.java:44) at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.execute(HikariProxyPreparedStatement.java) at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:47) at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:74) at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:50) at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117) at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76) at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:194) at org.flowable.common.engine.impl.db.DbSqlSession.update(DbSqlSession.java:107) at org.flowable.engine.impl.persistence.entity.data.impl.MybatisExecutionDataManager.updateProcessInstanceLockTime(MybatisExecutionDataManager.java:309) at org.flowable.engine.impl.persistence.entity.ExecutionEntityManagerImpl.updateProcessInstanceLockTime(ExecutionEntityManagerImpl.java:1065) at org.flowable.engine.impl.cfg.DefaultInternalJobManager.lockJobScopeInternal(DefaultInternalJobManager.java:167) at org.flowable.job.service.ScopeAwareInternalJobManager.lockJobScope(ScopeAwareInternalJobManager.java:79) at org.flowable.job.service.impl.cmd.LockExclusiveJobCmd.execute(LockExclusiveJobCmd.java:59) at org.flowable.engine.impl.interceptor.CommandInvoker$1.run(CommandInvoker.java:67) at org.flowable.engine.impl.interceptor.CommandInvoker.executeOperation(CommandInvoker.java:140) at org.flowable.engine.impl.interceptor.CommandInvoker.executeOperations(CommandInvoker.java:114) at org.flowable.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:72) at org.flowable.engine.impl.interceptor.BpmnOverrideContextInterceptor.execute(BpmnOverrideContextInterceptor.java:26) at org.flowable.common.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:53) at org.flowable.common.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:105) at org.flowable.common.spring.SpringTransactionInterceptor.lambda$execute$0(SpringTransactionInterceptor.java:57) at org.flowable.common.spring.SpringTransactionInterceptor$$Lambda$995/0x00007fbc63861fe8.doInTransaction(Unknown Source) at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140) at org.flowable.common.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:57) at org.flowable.common.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:30) at org.flowable.common.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:56) at org.flowable.common.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:51) at org.flowable.job.service.impl.asyncexecutor.ExecuteAsyncRunnable.lockJob(ExecuteAsyncRunnable.java:178) at org.flowable.job.service.impl.asyncexecutor.ExecuteAsyncRunnable.run(ExecuteAsyncRunnable.java:112) at org.springframework.cloud.sleuth.instrument.async.TraceRunnable.run(TraceRunnable.java:64) at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@17.0.8.1/Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@17.0.8.1/Unknown Source) at java.lang.Thread.run(java.base@17.0.8.1/Unknown Source)

Expected behavior
Job queue should be empty. Jobs should run.

Additional context
The problem was happening on 6.7.2, postgres 14 (14.10 (Debian 14.10-1.pgdg120+1))
Only one Flowable engine is used within Spring boot application 2.6.12