The diagram below looks fine at scale 1.0 but the sprite stays the same size as you decrease or increase the scale ratio. Limiting the scale using max dimensions has the same result. I think the top left position of the sprite is correct for the scaled sprite, but it also looks oddly off-centre, presumably since the sprite is always at 100% size.
@startuml
scale 0.5
sprite $Kubernetes [48x48/16z] {
bPE7WkqW24G7r9ZO-F-lVGKrOTdSLyxMQsLc4E_4WFyW3v6HyM_GEKGP9_tBQZ7yRGTVuhWO7-4YBnJ6Ay6k7iFk22-hgrY8n5BTZjZaAu0RQ14FLJpCugdO
dFAD4EGR9nPTF0COukcOa3SmaGudRoz1IVF8UCs023UqXkAyBDdo6t29ZA3cnjsXSMZTpGfeeXH2hWJW75A0CZkKwm6keZGeiadxHBdqCkbwno4Rw0BhYlgo
rczBv4Opox8fgh5efQggk3JpruyCn7b_rcCIT23OY4qm3JZaq5V0yzSQQBPWjhSra_gokjcAsQeFeALrevh957G0nSGTjwtS6k_W8yWwqcKp5xHJFL1jkStj
fkL8pFguMWtdra6fH9i09TaCmiDnu866RD8fofNNoU2K2GgTHy2w9QzrPxk3YmGSVRbmzqtF04VQfhQbuoYQHjZl8WGiQK4JBKSNPSX3ckuMNKhtXoGF8xi7
saMY1dNfRPrqw2QRlDH3QXtWbNtlfDxQlEnsLHfMvbN_HN85W8VR0Eex3rSykmTsTninq-euGyGalmr-FofZOpKJzvfZ236N7iXftJHpI9MRQgvkCF0m3MiW
TAFL4Fs9zZOloshk8fRXjJhD7g_LQ_PuhUuLlJC8RmJvGC0xILv9-0J55mYMdm
}
node Kubernetes <<$Kubernetes>> [
= Kubernetes
Description of k8s
]
@enduml
