This same issue also appears to occur in Eclipsis. The first player submitted report of this specific bug was at June 6th, but this bug might’ve started happening days before. Prior to around 8pm today, it happened infrequently but has increased drastically in frequency and now occurs in every game from my testing, severely impacting gameplay.
For instance, this spire is missing its entire bottom and appears to be floating.
I have verified that these missing parts are on the server using raycasts. Eclipsis’s terrain is composed of welded parts, and sometimes missing parts magically appear by destroying the parts adjacent.
Changing streaming pause to ClientPhysicsPause does not appear to impact this bug at all. For loading, Eclipsis briefly sets the player’s ReplicationFocus to a part near where the player will spawn, calls player:RequestStreamAroundAsync, and resets ReplicationFocus to nil afterwards. Here are the streaming settings, if relevant:
Edit: I have disabled streaming in Eclipsis until this issue can be resolved as player counts have dropped drastically.