Async: Values can get out of sync

[dummdidumm]

Describe the bug

If you have a value X that causes a pending batch, and while that batch is pending cause creation of another batch which creates a new branch and therefore new template effects which also read that value X, those template effects are not correctly rescheduled once the pending batch resolves. As a result, the shown values of X get out of sync (once shows the old, once the new value).

I believe it happens because the pending batch does not know of the new effects that are created (they are not in its (maybe_)dirty arrays), therefore does not schedule them as (maybe_)dirty on revival and therefore never runs them.

Reproduction

https://svelte.dev/playground/c7e416c4b97446468ee85f3abf4bc676?version=5.41.4#H4sIAAAAAAAACn1STYvbMBD9K4O6YJuY2NCb1zEsvfXQFtpb04PjjNNhZUlI47WF0H8vSpbsd4-a9-bNG70JQvUTikbcOa8GOMwnUYqRJDrR_A6CvUlgKojySjVm6x5Qcqodeofv1QetGBU70YjWDZYMd3u1Z5qMtgxf_pI8wmj1BNm2Or8eW7PbRJPIsMIObhz3jHm2aCuPWXHF_BNWp2pbPc1Q7WFm1gq0GiQN97vQn3fLC9h1EJJEVaVNGzjjoBV4OOCoLQLThGBn5WA2t7CQlHCPaGAFUo6OCB56hkc_SSq5zGZFD2gdZnsVY7e21cXB-24uPvxmEzu_2bzghk80pr13zzVjGhP6pScGhQv8sHoih7lNMg75F02oZ85tCZ_rui6Kc0N7-eKwRqi6vQoVjfE6wkMH9X9oohSMK4uG7Yyx_OAOnsf28hJeIR_cQgoywAoxhWmsNi6_JDxo5bTErdSnfH0Tb_j68_u3rWNL6kSjz8Maizee_5SCe5ILqaNoxl46jP8Amw0uj-sCAAA

Logs

System Info

irrelevant

Severity

blocking an upgrade