Edit: Well yes I knew that, but you should be able to buy it again, yet you can't. This is a ug, but from the posts I've read, no Mod has said anything regarding this.
It should still be a per character unlock liek the Boffs
Mods have no say either way on what is or isn't a bug or how things are handled.
I haven't bought a tribble in a long time so I can't say either/or but double check that the tribble doesn't show as an account bound item and also check under legacy unlocks in the c-store window.
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