Linux fhome.lan 4.19.0-17-amd64 #1 SMP Debian 4.19.194-2 (2021-06-21) x86_64 GNU/Linux
Debian GNU/Linux 10 (buster)
openjdk 11.0.11 2021-04-20
OpenJDK Runtime Environment (build 11.0.11+9-post-Debian-1deb10u1)
OpenJDK 64-Bit Server VM (build 11.0.11+9-post-Debian-1deb10u1, mixed mode, sharing)
the launcher complains "Your Java Runtime is incompatible" for minecraft version 1.14.4 and JRE 1.11.
JRE 1.11 did work correctly with minecraft versions 1.6 to 1.16.5, and there is no reason to complain about incompatible version and/or download/install older JRE version.
MCL-18306 Newer versions of Java are blocked