Debugger loses variable scope in the last line of a block

[sszigeti]

Godot version

3.3.3.stable + v4.0.dev.20211004.official [2e8cba0]

System information

All

Issue description

As it was reported in 2019 the debugger loses scope in the last line of a block. The original reporter has promised to create a new issue but I don't think this happened, and when I saw that this is still an issue in 4.0.dev, I wanted to make sure it's not forgotten.

Steps to reproduce

Have a script like this:

for x in 5:
    my_func(x) # set a breakpoint here

The debugger won't see the x variable -- unless you edit the script and add another command after this single line

Minimal reproduction project

No response

[sszigeti]

This PR might be a fix for this.

[akien-mga]

See #63009 for a MRP.

According to that issue, this should be fixed in 4.0 now, but still reproducible in 3.x.

[akien-mga]

Fixed by #71093.