Unexpected behavior with formatting a comment in Python syntax with gqq

[leonardt]

Describe the bug
When using gqq to format a Python comment, the line before it is included.

To Reproduce
Example code:

def foo():
    # This is a comment
    # This is a really long comment line that should be line wrapped using gqq but it shouldn't affect the line above it

Expected behavior
Using gqq on the third line (long comment) should produce (using vim 8.2)

def foo():
    # This is a comment
    # This is a really long comment line that should be line wrapped using gqq
    # but it shouldn't affect the line above it

Actual behavior
Instead I get this:

def foo():
    # This is a comment This is a really long comment line that should be line
    # wrapped using gqq but it shouldn't affect the line above it

Versions
startup, version: 4107 linux x64 channel: stable

[gerardroche]

This is due to a regression in ST4 sublimehq/sublime_text#3177