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Oldschool /sync lazy_loaded_members_cache makes lazy-loading sync non-idempotent

A-Lazy-Loading

A-Sync

O-Uncommon

S-Minor

T-Defect

Status: Open.

#19978 In element-hq/synapse;

· reivilibre opened on Jul 17, 2026

State resets or blank timelines if origin's /get_missing_events omits key auth events

A-Messages-Endpoint

Status: Open.

#19970 In element-hq/synapse;

· gamesguru opened on Jul 15, 2026

The new_token parameter of Notifier.on_new_event seems to be misunderstood

A-Workers(includes replication)(includes replication)

T-Defect

Status: Open.

#19969 In element-hq/synapse;

· reivilibre opened on Jul 15, 2026

Version picker on documentation site gets stale

A-Docs

Status: Open.

#19967 In element-hq/synapse;

· MadLittleMods opened on Jul 15, 2026

Room suddenly gets unusable

A-Send-Event-Endpoint/send/{eventType}/{txnId}/send/{eventType}/{txnId}

A-State-Resolution

T-Defect

Status: Open.

#19964 In element-hq/synapse;

· pdelacroix opened on Jul 15, 2026

Gauge callbacks aren't thread safe

A-Metrics

T-Defect

Status: Open.

#19961 In element-hq/synapse;

· MadLittleMods opened on Jul 14, 2026

Synapse federates Ed25519 public keys with invalid Edwards points

Status: Open.

#19951 In element-hq/synapse;

· gamesguru opened on Jul 12, 2026

Apply strict MSC4311 stripped state validation after 2027-06-01

A-Invite

A-Knock

A-Spec-Compliance

Status: Open.

#19943 In element-hq/synapse;

· MadLittleMods opened on Jul 9, 2026

MSC4446: Allow moving the fully read marker to older events

T-ExperimentalFeatureTracking issues for experimental features in SynapseTracking issues for experimental features in Synapse

Status: Open.

#19940 In element-hq/synapse;

· SpiritCroc opened on Jul 9, 2026

Complement TestOIDCProviderUnavailable should use a clean deployment (cross-test pollution from modified homeserver config being re-used)

A-Testing

Status: Open.

#19937 In element-hq/synapse;

· MadLittleMods opened on Jul 8, 2026

Support Matrix 1.19

A-Spec-Compliance

T-Task

Status: Open.

#19933 In element-hq/synapse;

· turt2live opened on Jul 8, 2026

Support Matrix 1.18

A-Spec-Compliance

T-Task

Status: Open.

#19932 In element-hq/synapse;

· turt2live opened on Jul 8, 2026