When there is a scenario similar to JBPM-9717 - a subprocess with a timer throws an exception- the transaction is rollbacked and the new query at getTimerMappingInfo fails, so timers are never deleted.

Entering getTimerMappinInfo

[KIE-LOG] STDOUT: 19:16:49,376 DEBUG [org.hibernate.SQL] (EJB default - 1) select timermappi0_.id as id1_43_, timermappi0_.externalTimerId as external2_43_, timermappi0_.info as info3_43_, timermappi0_.kieSessionId as kieSessi4_43_, timermappi0_.timerId as timerId5_43_, timermappi0_.uuid as uuid6_43_ from TimerMappingInfo timermappi0_ where timermappi0_.uuid=?
[KIE-LOG] STDOUT: 19:16:49,376 WARN [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (EJB default - 1) SQL Error: 0, SQLState: null
[KIE-LOG] STDOUT: 19:16:49,376 ERROR [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (EJB default - 1) IJ031070: Transaction cannot proceed: STATUS_ROLLEDBACK