Per participant key lost between js-sdk and EC in embedded mode

[hughns]

10:27:25.999 Decryption failed for event $V41v4SurT7YQYmPqw8-Ja_aNedyzC9X_7FP6K0d8Bd0: MEGOLM_UNKNOWN_INBOUND_SESSION_ID will retry once only
...
10:27:27.000 Decryption succeeded for event $V41v4SurT7YQYmPqw8-Ja_aNedyzC9X_7FP6K0d8Bd0 after retry
...
10:27:27.000 Setting key at index 0 for @hughns:ess-ecall-poc.ems-support.element.dev:YERKDYHWCR with timestamp 1723541245901: Jq4FqHsIlxdcje1qY4hJog

Then there is no subsequent log entry like:

MatrixKeyProvider Sent new key to livekit room=!ZWXChHvbxzRiDtOPzC:matrix.org participantId=@hughns:ess-ecall-poc.ems-support.element.dev:YERKDYHWCR encryptionKeyIndex=0: Jq4FqHsIlxdcje1qY4hJog