From the linked summary^1 by Jennifer Ouellette:

>Archaeologists excavating an early Roman imperial tomb in Turkey have uncovered evidence of unusual funerary practices.

>Instead of the typical method of being cremated on a funeral pyre and the remains relocated to a final resting place, these burnt remains had been left in place and covered in brick tiles and a layer of lime.

>Finally, several dozen bent and twisted nails, some with the heads pinched off, had been scattered around the burn site.

>It's the 41 broken and bent nails—25 bent at a 90 degree angle with the heads pinched off, 16 bent and twisted but otherwise whole—recovered from the site that set this cremation apart.

>These were not coffin nails, which are usually found intact, and nails weren't used in the construction of the funeral pyre.

From the peer-reviewed article^2 by Johan Claeys, et al.:

>Aside from the application of nails to symbolically fix the spirit, heavy weights were also used in an attempt to immobilise the physical remains of a potential revenant (Ogden 2002: 164–66; Alfayé 2009: 191–97).

>The curse ‘sit tibi terra gravis’ (‘may the earth rest heavily upon you’) was sometimes used in contrast to the epitaph ‘sit tibi terra levis’ (‘may the earth rest lightly upon you’) that was commonly reproduced in Roman funerary inscriptions in full or abbreviated (‘s.t.t.l.’) form (Tolman 1910: 5 & 21).

>The combination of nails and bricks designed to restrain the dead with the sealing effect of the lime strongly implies a fear of the restless dead.

>Regardless of whether the cause of death was traumatic, mysterious or potentially the result of a contagious illness or punishment, it appears to have left the dead intent on retaliation and the living fearful of the deceased's return.

^1 Jennifer Ouellette for Ars Technica/Advance Publications, 17 Mar. 2023, https://arstechnica.com/science/2023/03/bent-nails-at-roman-burial-site-form-magical-barrier-to-keep-dead-from-rising/

^2 Claeys, J., Van de Vijver, K., Marinova, E., Cleymans, S., Degryse, P., & Poblome, J. (2023). Magical practices? A non-normative Roman imperial cremation at Sagalassos. Antiquity, 97(391), 158-175. https://doi.org/10.15184/aqy.2022.171