vm.runInContext() breaks delete on v18.2.0

[alexlamsl]

Version

v18.2.0

Platform

Microsoft Windows [Version 10.0.14393]

Subsystem

vm

What steps will reproduce the bug?

$ cat test.js
var a = "direct";
delete a;
console.log(a);

var vm = require('vm');

vm.runInThisContext(`
var b = "this";
delete b;
console.log(b);
`);

vm.runInContext(`
var c = "new";
delete c;
console.log(c);
`, vm.createContext({ console: console }));

How often does it reproduce? Is there a required condition?

Always

What is the expected behavior?

$ node -v
v4.9.1
v6.17.1
v8.17.0
v10.24.1
v12.22.12
v14.19.1
v16.14.2
v18.0.0

$ cat test.js | node
direct
this
new

What do you see instead?

$ node -v
v18.2.0

$ cat test.js | node
direct
this
undefined

Additional information

No response

[dnalborczyk]

introduced by: #42963

related: #42962

[alexlamsl]

Still reproducible on v18.8.0