Confirmed and root-caused; fix in progress. Cleric Heal currently only heals the caster — there is no party-heal relay, so allies are never told about the heal. Adding one (heal reaches same-map party members in range, as in authentic v83) is deeper netcode work and is underway.

Fixed. Cleric Heal only healed the caster — there was no party-heal relay at all. Added one, mirroring the working party-buff relay: the caster now relays the rolled heal amount to co-located party members inside the skill's range, and each applies it to their own HP (authentic v83 same-map party heal). NOTE: this one has a server half (the realtime server's relay allowlist), so unlike the other fixes it needs the realtime server redeployed AND the client published before it goes live. Re-test after both.

Live in the latest publish — marking this Fixed. Thanks for the report!