fix: fix issue of cases where prevCondition is a subscriber

[prathik]

The current logic does an or operation between condition and prevCondition.

In condition the value of subscriber could be false and in prevCondition it could be a subscription set.

The change addresses this by picking the first non false subscriber.

Added some debug logs to show the case (in the image).

[prathik]

@leibale @luin any advice on this?

[lukas-becker0]

@prathik luin is no longer the maintainer AFAIK and the redis team seems to focus on https://github.com/redis/node-redis, you could move this PR to https://github.com/valkey-io/iovalkey which is the most promising fork IMO.

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