Checklists have small checkboxes and it's easy to miss them. Now a single-tap selects the item and opens the bottom menu so often this happens as an undesired result of trying to check an item. I'm unsure about this behavior becoming worse with the last update or not, but I'm noticing now more than before (the action is now item selection instead of note editing).
Possible solutions:
Note that the second solution will improve checklist usability in general, since it was already rather difficult to check an item in one attempt before the update. The problem of small fonts was now ameliorated but only to some extent.
Make the entire line clickable
This sounds good.
Thinking about this a bit more maybe a good compromise solution would be to make the checkbox and say it's next five characters clickable, so there is little chance of the reciprocal problem: the user wants to select the item and, since he/she is accustomed to click anywhere in the item area, the checkbox is toggled instead. I don't know about the implementation, but I suppose it's just a matter of chosing a different text pattern to click over.
Alternatively How about a "click and hold" action which will check the box if there is one? Don't even know if this is possible... Just an idea.
That won't solve the ambiguity because there is already a tap-n-hold action.
Most helpful comment
This sounds good.