Further stages:
https://www.inaturalist.org/observations/145914060 (12 of Dec 2022)
https://www.inaturalist.org/observations/145952766
https://www.inaturalist.org/observations/145952767 (24 of Dec 2022)
https://www.inaturalist.org/observations/147379192 (1st adult, 18 Jan 2023)
https://www.inaturalist.org/observations/148391465 (2nd adult, 9 Feb 2023)
https://www.inaturalist.org/observations/149490464 (several pupa taken out of the ground, 23 Feb 2023)
https://www.inaturalist.org/observations/150715700 (3d adult, 9 March 2023, two adults appeared that day)
https://www.inaturalist.org/observations/151739131 (5th adult, 20 March 2023)
https://www.inaturalist.org/observations/152613259 (6th adult, 28 March 2023)
The knot was made by a mole, Talpa europaea.
When moles find a lot of worms, more than they could eat, the knot them to avoid escaping, and keep them in some place, something as a food safe...