Nested Comments: some icons missing from visual editor when replying to comment

Hi Kentaro,
Firstly, this is an amazing plugin, thank you!

I notice one small issue which I hope you have some time to look into, please… I found that with threaded (nested) comments enabled (Settings>Discussion), when clicking to Reply to a comment, some options are missing from the visual editor menu such as the icons for lists, insert img, read-more, link, unlink, special characters, font color.

However,if I have already made a comment on the thread and click to Edit comment, all the icons are visible. And then, if I cancel editing that and go back to Reply to a comment instead as initially intended, the missing icons are now visible too.

Something seems to prevent the comment reply from showing all icons/options in visual editor to begin with.

Best regards,
MBV