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In the first match this is normal especially with Real Madrid under a new coach. Of course it takes time to develop creativity to create more chances and score more goals. In the match against Osasuna, Real Madrid's play was quite solid, and their defense has certainly improved. However I saw that Real Madrid needed composure to control the rhythm of the game.
Perhaps it's because of the new coach with a new strategy and several new players that's affected their composure. I hope they'll play more calmly in the coming matches so they can score more goals, especially against opponents who employ a defensive strategy. Real Madrid will certainly need better creativity to penetrate a tight defense. But overall Real Madrid's play so far has been very different from Ancelotti's, who relied solely on Vini on the wings.
You're right, it's the start of the season for every team and everyone in the squad. However, all teams have had ample time for pre-match preparation, and they've even played several pre-season matches before the new season begins. Sometimes things don't go according to plan, and a coach can take a different strategic approach to win a match, even though in that match Real Madrid only won because of a penalty from Kylian Mbappe.
Real Madrid completely dominated the game, forcing Osasuna to defend as best they could. Osasuna managed to put Real Madrid in trouble, especially because they played a very defensive game, making it difficult for Madrid's players to score. I didn't watch the match, but the statistics tell me that Real Madrid worked hard to win.