I faced with the same problem on debian buster (testing). After upgrading of libfreetype6 package the teamviewer gui stop working. There is a better solution. I download i386 libfreetype6 package for debian stable from packages.debian.org. Then I unpack this package and put two files from them (libfreetype.so.6, libfreetype.so.6.12.3) to /opt/teamviewer/tv_bin/RTlib/ directory. Results: 1) system package libfreetype6 was NOT replaced by older version 2) teamviewer works just fine.
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