Frosted ice (ice from frost walker) doesn't melt in the end even when spawned in using normal condition of using frost walker enchantment. Frosted ice (the ice from frost walker), is supposed to be temporary and not related to light levels.
An example has been attached showing this issue.
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It does not make sense that it doesn't melt when there is not enough light for the frost walker ice to melt even when it have been made by frost walker (not setblocked or anything like that), as it's supposed to be temporary and not related to light levels.
@unknown: Both tickets you linked to are old Mod WAIs, which means this is not an official Mojang resolution.
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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I believe this is working as intended.
Also, the reason for the ice not melting is because you're in the end, which is technically like space, the temperature is too cold for ice to melt and there is no light source.