MC-277603 was fixed in 24w38a, bringing High Norwegian (hn_no) in the game. However, this fix was applied to asset indexes 1.json ~ 16.json and 18.json but not 17.json, which means that the versions that use this index, namely 24w18a through 24w35a, including current release version 1.21.1, does not have High Norwegian available.
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This appears to be fixed now, i.e. hn_no.json correctly appears is index 17. I remember that it was fixed in pre-1, presumably when new translation files for the Winter Drop strings are pushed, but it may be too late to check that precisely now.
Iām able to reproduce the reported behavior.