Oracle 19.11 deinstall failed with "ERROR: oracle/rat/tfa/util/ManageTfa"

After Oracle database 19c home is applied Release Update 19.11.0.0.210420, the home cannot be de-installed anymore.

The deinstall utility will fail with errors,

######################## DEINSTALL CLEAN OPERATION START ########################

## [START] Preparing for Deinstall ##

Setting LOCAL_NODE to thanos

Setting CRS_HOME to false

Setting oracle.installer.invPtrLoc to /tmp/deinstall2021-05-02_07-34-15PM/oraInst.loc

Setting oracle.installer.local to false

ERROR: oracle/rat/tfa/util/ManageTfa

Exited from program.

############# ORACLE DEINSTALL TOOL END #############

In deinstall error log,

java.lang.reflect.InvocationTargetException

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.lang.reflect.Method.invoke(Method.java:498)

        at oracle.install.db.deinstall.wrapper.Deinstall.callCleanImpl(Deinstall.java:1876)

        at oracle.install.db.deinstall.wrapper.Deinstall.main(Deinstall.java:907)

Caused by: java.lang.NoClassDefFoundError: oracle/rat/tfa/util/ManageTfa

        at oracle.install.db.deinstall.core.PrepForOUIDeinstall.cleanConfig(PrepForOUIDeinstall.java:187)

        ... 6 more

Caused by: java.lang.ClassNotFoundException: oracle.rat.tfa.util.ManageTfa

        at java.net.URLClassLoader.findClass(URLClassLoader.java:382)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:418)

        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)

        at java.lang.ClassLoader.loadClass(ClassLoader.java:351)

        ... 7 more

Looks like something related to TFA is missing after RU 19.11 is applied.

Workaround,

Roll back RU 19.11, then re-run deinstall utility.