You're correct that they don't 'count' in the sense that they don't change the days-in-Canada count, but then neither do trips where one departs one day and returns the next.Same day trip don't count
Nonetheless: I'd suggest including them. If it can't be done on the electronic form because of limitations, include a sheet of paper and provide that additional info (with brief explanation the form doesn't let you do one day trips).
Why? Because credibility matters, and if IRCC does check the entry-exit info and discovers a bunch of un-reported trips, you have not only made their job easier* (they don't have to check the dates), but you've improved your credibility tremendously.
*Note, CBSA doesn't directly collect exit information, but must get it either from the airline manifests (still haven't heard that works) or from US CBP. Meaning, it is highly likely that these are not presented in easy tabular format one against the other, but must be checked 'manually' (or possibly using some dtabase tool). IN other words, possibly not easy, and possibly error prone. If you provide a simple table in a logical layout which they can cross check, and the dates are correct, you have made their job easier and far more likely to just get it done and approve quickly.
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