Are the hadiths mentioned in the question—such as Umar ibn al-Khattab praying more than 20 rak'ahs in Tarawih, and the hadith "Its beginning is mercy, its middle is forgiveness, and its end is salvation from the Fire," and the hadith "Paradise lies under the feet of mothers"—actually weak, and is considering them a Sunnah or performing them with the intention that they are a Sunnah considered an innovation?

The performance of twenty rak'ahs by people in Ramadan (definition) during the caliphate of Umar ibn al-Khattab was narrated by Al-Bukhari. As for the hadith (definition), "Paradise is under the feet of mothers," it is weak with this wording, but its authenticity is supported by the hadith, "Stay with her, for Paradise is under her feet." Whoever acts upon a Sunnah (definition), believing it to be authentic due to ignorance of the weakness of its origin, is not considered an innovator due to their ignorance, just as the Salaf did not declare as innovators those who acted upon abrogated or weak rulings. It is advisable to associate with scholars and books that clarify the authentic from the weak.