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

**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 (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