mcp server not killed correctly when started with npx

[feloy]

On Mac:

% npx kubernetes-mcp-server@latest --port 8080

% ps
32354 ttys003    0:00.35 npm exec kubernetes-mcp-server@latest --port 8080    
32370 ttys003    0:00.03 node /Users/phmartin/.npm/_npx/acdc49484db51b02/node_modules/.bin/kubernetes-mcp-server --port 8080
32371 ttys003    0:00.04 /Users/phmartin/.npm/_npx/acdc49484db51b02/node_modules/kubernetes-mcp-server-darwin-arm64/bin/kubernetes-mcp-server-darwin-arm64 --port 8080


% kill 32354
% ps
32371 ttys003    0:00.04 /Users/phmartin/.npm/_npx/acdc49484db51b02/node_modules/kubernetes-mcp-server-darwin-arm64/bin/kubernetes-mcp-server-darwin-arm64 --port 8080

Note that, started without any flag, the server is stopped:

% npx kubernetes-mcp-server@latest

% ps
32840 ttys003    0:00.35 npm exec kubernetes-mcp-server@latest  
32856 ttys003    0:00.04 node /Users/phmartin/.npm/_npx/acdc49484db51b02/node_modules/.bin/kubernetes-mcp-server
32857 ttys003    0:00.03 /Users/phmartin/.npm/_npx/acdc49484db51b02/node_modules/kubernetes-mcp-server-darwin-arm64/bin/kubernetes-mcp-server-darwin-arm64

% kill 32840
% ps

I changed the command started by execFileSync at https://github.com/containers/kubernetes-mcp-server/blob/main/npm/kubernetes-mcp-server/bin/index.js#L24C14-L24C26 with a shell command (sh and sh -c "sleep 100s"), and the same problem happens.