After https://issues.redhat.com/browse/JBTM-3879 implementation we were reported by the narayana-spring-boot-team that there was an issue with JBTM-3879: see https://github.com/snowdrop/narayana-spring-boot/pull/148
The early called recover(XAResource.TMENDRSCAN) does cause a disconnect of the internal used JDBC connection (see narayana-spring-boot/narayana-spring-boot-core/src/main/java/dev/snowdrop/boot/narayana/core/jdbc/DataSourceXAResourceRecoveryHelper.java line 112 ).
Investigate if a later recover(XAResource.TMENDRSCAN) call can be done so that it doesn't cause an early disconnect of the JDBC connections, but please consider the reason for JBTM-3879, which is https://issues.redhat.com/browse/AG-238.