Hi, The commit that updated icecat from version 91.13.0 to 102.3.0 is 4e88a7bfcb70f25219d9f2887121ae196431a115. One of the changes listed is an update from icu4c (which is/was at version 69.1) to icu4c-71 (71.1). ICU seems to deal with reading /etc/localtime and /etc/timezone, so perhaps its behavior changed.
-- Thanks, Maxim