[MC-309287] The behavior of the redstone comparator is different from that in older versions

This behavior appeared after the way lecterns drop books was refactored in 25w02a

breaking a lectern in 1.21.5+ does not trigger a comparator update, like in the image.

Linked issues

duplicates 1

MC-94566 Breaking non-container comparator-enabled blocks doesn't send a comparator update through blocks Open

Attachments

1.21.5- (10f9b2b7-01cc-48b6-88cd-6d255d8edd66).png

1.21.5+ (c1152029-28c7-4504-acdf-7a42c7a451d6).png

Comments 3

Automation for Jira 2026-06-26T16:44:19Z

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[MCQA] jKakub 2026-06-30T13:16:19Z

Hi!
Thank you for your report!

We're already tracking this issue at MC-94566, so I will resolve and link this ticket as a Duplicate.

I suggest also to browse through the main issue for potential fixes.

If you would like to add a vote and any extra information to the main ticket it would be appreciated.

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YukiSugar 2026-06-30T15:29:57Z

I can't understand why this was marked as a duplicate. As mentioned above, the lectern was working fine before 25w02a, and then you changed it and introduced a bug, just to make the lectern share the same ancient bug as other blocks?😰