autocomplete shows completion popup when beginning a new line from normal mode in some cases #19308

Beginning a new line from normal mode by using o, O shows the completion popup when using autocomplete and having o (omnifunc) completion source enabled for some languages e.g. python.

A minimal .vimrc to replicate this:

filetype indent on
set autocomplete
set complete=o^5,.^5,w^5,b^5,u^5

A minimal python file to replicate this:

def test(x):
    return x

In normal mode pressing o on line 1 shows popup in new empty line. Same with pressing O on line 2.

Auto indentation setting can be any of:

• filetype indent on
• set smartindent
• set autoindent
• set cintent

Is there a way to don't show the popup automatically in this case?