term_sendkeys({buf},{keys}) move cursor to the next line if {keys} is empty

Question

I am running gvim 9.0 on Windows 10. I am developing Python code. I am using Miniconda and I run gvim from a Miniconda CMD shell.

For this reason I prepared a .bat file for starting gvim with the following content

@echo off
call C:\Users\myself\Miniconda3\condabin\activate.bat C:\Users\myself\Miniconda3\envs\myenv
gvim -c "vert botright call term_start('C:\\Users\\myself\\Miniconda3\\condabin\\conda.bat activate myenv && echo Conda env:%CONDA_DEFAULT_ENV% && ipython --profile=autoreload_profile', {'term_name': 'IPYTHON'})"

In my .vimrc I have defined the following variable and mapping

let g:ipython_terminal_name = 'IPYTHON'
autocmd FileType python nnoremap <F9> yy \| :call term_sendkeys(g:ipython_terminal_name,@")<cr>j0

but I noticed a strange behavior that I wish to explain through an example. Consider the following text (on the left I reported the line numbers)

1 a = 3
2 b = 5
3 
4 c = 3
5 d = 4
6 
7 e = 5

If cursor is located on line 3 and I hit F9, then nothing is sent to the terminal (as it should be) but then the cursor jumps directly to line 5 (i.e. line 4 is skipped). This happens only when the cursor is located on a blank line.

I cannot understand why this happens, if someone could explain I would be grateful. I would be even more grateful if someone could suggest a workaround.

If more details are needed, please let me know so I can update the question.