I bump the version from 0.20.0 to 0.21.0. Error on startup:
0bitcoind: util/time.cpp:69: int64_t GetTimeMicros(): Assertion `now > 0' failed.
rolled back to 0.20.0 and the issue disappeared.
See my docker repo: https://github.com/Zetanova/docker-bitcoin
System information raspberry pi 3 arm64 ubuntu 20.04 docker