Librarian trading for ink sacs does not accept ink sac trades. When ink sacs are added to the trade slot manually, a hover bar states "Trader does not want this." Others have reported in Reddit, but I didn't find any reports in this bug tracker.
https://www.reddit.com/r/Minecraft/comments/kbewg2/villager_wants_ink_sac_but_isnt_trading/
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We're tracking this issue in MCPE-101087, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MCPE-101087