Session data no longer updates when the backend tells us our session is full which then limits the ability to modify the session size on the fly. Because of this, joinability will be set on the session 

Steps to Reproduce
  1. Create a Steam session with the NumPublicConnections set to 2
  2. Set the NumPublicConnections to 1
  3. Set the NumPublicConnections to 2
  4. Observe that the session is no longer joinable

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ComponentOnline - OSS - Steam
Affects Versions4.204.21
Target Fix4.23
Fix Commit6102885
Main Commit6843774
CreatedApr 25, 2019
ResolvedApr 26, 2019
UpdatedJul 24, 2019