Article from the-race.com on the penalty Norris received for backing up the pack to create space for a double-stack. The article starts:

Lando Norris and his McLaren Formula 1 team were surprised by his penalty for “unsportsmanlike” conduct in the Canadian Grand Prix and felt it was a departure from how such incidents are usually judged...

I have not much of an opinion about whether this behavior should get a penalty or not... but good stewarding is consistent stewarding, and this is not that. If they are aiming to establish a new stricter and consistent standard here then it seems that should have been articulated in the race-director's notes and driver's briefing at the start of the weekend. If this batch of stewards just don't know the relevant precedents and backing up the pack will be fine again next race... well... doing better than that would be nice.