Getting ERR_UNKNOWN_FILE_EXTENSION with .mts files on node 20

[bonham]

I want to run typescript code in files with .mts extension. For node 18 this worked well with
ts-node --esm myfile.mts

But with node 20.10.0 / ts-node 10.9.1 I am getting:

Result: TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".mts" for myfile.mts

My tsconfig.json:

{
  "compilerOptions": {
    "module": "NodeNext"
  }
}

Any idea how to get .mts files working again?

[bonham]

ok I found this issue which is explaining why:
#1997