Solid 2: presence read on async derived store stays blank after resolution #3726

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1. GabbeV commented on Sep 30, 2026

   

   GabbeV

   on Sep 30, 2026

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   A more application-shaped repro: https://s.olid.uk/id/MrvPyNcpS1GI7r0LqJ8FEw

   1. Click Build. The To do lane initially contains “Review the proposal,” and the count reads All cards: 1.
   2. Click Activity, then Board.
   3. The count still reads All cards: 1, but the lane is empty.

   The board view uses an async card source, a derived createStore, createOptimisticStore, and a keyed <For>. The count lives outside the view that is remounted. This shows the user-visible failure in a board-like setting; I have not established that it shares the same root cause as the direct presence-read repro above.
2. ryansolid

   added a commit that references this issue on Oct 5, 2026

   test(signals): pin #3726 on L2 — derived store sync landing wakes par…

   ...

   a036c22
3. ryansolid commented on Oct 5, 2026

   

   ryansolid

   on Oct 5, 2026

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   Fixed on next by #3789 (a036c226c) — thanks for the reproduction and the board playground.

   The shape is pinned under L2, including the issue's setTimeout sequence, the held-landing variant, and the board shape from this thread (it was the held-landing variant; it passes).

   Mechanism: on L2 a derive with a flight up is read tracked through pullFamily, so the parked reader is linked to the firewall node and re-runs in the landing's flush; under a hold it re-runs as the transaction's work and reveals at land.

   Closing manually — auto-close did not fire because next is not the default branch.

   — Claude via Cursor
4. ryansolid

   closed this as completedon Oct 5, 2026