It seems that the international name for that beach is "Agios Antonios"
Source: https://www.go-thassos.gr/about-thassos/places

Missing "Tarsanas" beach. Local name "Ταρσανάς".
Source: https://www.go-thassos.gr/about-thassos/places/tarsanas-beach

Potos

La Scala Beach, nestled on Thassos's southern coast, is known for its dramatic cliffs and crystal-clear waters. With soft sands perfect for relaxation and swimming spots ideal for snorkeling, it's a must-visit destination for tranquil moments and breathtaking views.

name=ΙΩΠΑ / IOPA
node/4917099943

shop=ΠΑΡΑΔΟΣΙΑΚΑ_ΠΡΟΪΟΝΤΑ_ΘΑΣΟΥ ? What is the meaning of that shop value? What kind of services or products are sold here? Is anything from shop=* fitting? Maybe new value needs to be invented? Maybe this data is wrong and there is no shop here? Maybe it is not a shop but something else?

Appartment Hotel „Celines Rose“.
Web: https://celinesrose.gr/

Missing beach "Agios Vasileios".
Source https://www.go-thassos.gr/about-thassos/places/agios-vasileios-beach

Fisherman's Hut

Glikadi beach

Unable to answer "What kind of building is this?" for way/209114903 via StreetComplete 45.1:

That building doesn't exist anymore

Attached photo(s):
https://westnordost.de/p/105727.jpg