Selected text
Cant select
1.4.1
Win 10 x64 1909

I can duplicate this, it seems to be specific to the checkboxes. I noticed that if you move the cursor over so that you wouldn't select a checkbox it works okay until you encounter another group of checkboxes (since the cursor is back at the beginning of the line).
It works fine if you select by clicking and dragging over text, it only seems to be a problem when using shift + arrow keys.

I got it. I just do not use the mouse and work mostly from the keyboard when editing a note.
I understand, I鈥檓 just providing more details about what works/doesn鈥檛 work
This is caused by the fact that technically, the caret cannot be positioned at offset 0 when a checkbox is at the beginning of the line. A fix will likely require a listener on Shift+DownArrow that calculates an adjusted caret position.
For keyboard users, a temporary workaround is to use Opt+Shift+RightArrow instead.
Resolved in #2148