Two other cable cuts/"damages" happened around the same dates. Two separate Arelion-owned cables between Sweden/Estonia and Finland/Estonia.

https://www.aftonbladet.se/nyheter/a/JOow58/kabelbrott-mella... (Swedish)

[...] two of their submarine cables – one between Sweden and Estonia and one between Estonia and Finland – have been damaged. The first cable was damaged on December 30th and the second on December 31st.

(Arelion is AS1299/formerly known as Telia Carrier. The name change happened because it's now owned by a Swedish government-managed infrastructure-focused pension fund.)