The 'Known Isssues' blog post (23rd Mar) mentions Hunter gauntlets 'Thunderhead Gips' missing from transmog menu but it is only partially true as the item is present in the transmog menu but not avalible for unlocking (at least for me). The item that is actually missing from the transmog menu after obtaining and unlocking it in the collections tab for me is the Hunter gauntlet 'Unyielding Favor Grips' from the seasonal set, and I do not see this issue being mentioned from the know issues list.
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The thunderhead grips look like they were stealth fixed in Thursday update, but that seems to have moved the issue over to the unyielding favor grips instead. [quote] I do not see this issue being mentioned from the know issues list.[/quote] The known issues page is a curated set of issues that are missing a significant amount of things.