The "Data Purge Behavior" values defined under "First Time Setup" were not saved; instead they reverted to their default values. The work around was to set them under Configuration->Settings.
A user was not prompted to define their time zone and locale values upon initial login.
Updated the following components to the version listed: Apache Tomcat v8.5.84, Guava v31.1, jQuery Migrate v3.4.0, JRE v8u371.b11, MySQL Server v8.0.32, OpenSSL v1.1.1s, Spring Framework v5.3.24, Spring Security v5.7.5.