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Solid 2: presence read on async derived store stays blank after resolution #3726
Description
Activity
A more application-shaped repro: https://s.olid.uk/id/MrvPyNcpS1GI7r0LqJ8FEw
- Click Build. The To do lane initially contains “Review the proposal,” and the count reads All cards: 1.
- Click Activity, then Board.
- 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.- added a commit that references this issue
on Oct 5, 2026 Fixed on
nextby #3789 (a036c226c) — thanks for the reproduction and the board playground.The shape is pinned under L2, including the issue's
setTimeoutsequence, 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 atland.Closing manually — auto-close did not fire because
nextis not the default branch.— Claude via Cursor
Describe the bug
An
inexpression on a derivedcreateStorestays blank after its pending source resolves. A sibling expression reading the source signal updates toresolved, but the presence expression neither showspresentnormissing.The component returns a pending promise from the store derivation, then sets the source signal to
[1]and resolves that promise with[1]in the same timer callback. The read is inside<Loading>, which has finished showing its fallback.Your Example Website or App
https://s.olid.uk/id/ffhim7PpQ5G0sPHlyO7JPg
Steps to Reproduce the Bug or Issue
Source: resolved.Presence:has no value.Expected behavior
Presence: present. The derived store has resolved to[1], andlengthexists on that array.Platform
2.0.0-rc.13