[FIX] Read Receipts were not working properly with subscriptions without ls #15656
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May be related to #15484 (comment)
The Read Receipts logic was getting the oldest
ls
(last seen, field where we store the time the user read the subscription last time) for the channel, so if some user, like a bot, was in the channel without that property set yet, the result could beundefined
. If that user never enter in the channel to receive his firstls
the read receipts would stop working (the case for the bots)