Unthreaded receipt is not returned in the next syncs

[florianduros]

Description

I'm investigating cases of stuck unread on EW. When I'm sending an unthreaded receipt on a room with unread threads, my receipt doesn't appear in the next syncs. Maybe is due to that the last event of the room is an user renaming

Steps to reproduce

In a room:

• Unread threads
• Main timeline is read
• The last event of the room is an user renaming

I send an unthreaded receipt:

POST https://element.ems.host/_matrix/client/v3/rooms/!jSkNtsjcsXfCRJwGpp%3Amatrix.org/receipt/m.read/%24UVcMglbqEZkuH2fq5zzbH-gQGyIU3MKr83qdtWUJwHg

The next syncs don't include my receipt.

RoomId: !jSkNtsjcsXfCRJwGpp:matrix.org Last important eventId: $UVcMglbqEZkuH2fq5zzbH-gQGyIU3MKr83qdtWUJwHg

Homeserver

element.io

Synapse Version

1.107.0

Installation Method

I don't know

Database

.

Workers

Single process

Platform

.

Configuration

No response

Relevant log output

.

Anything else that would be useful to know?

No response