Join-in-progress players on a Physics (Beta) island sometimes can't walk forward until they respawn

Summary

On my physics-enabled island (Enable Physics (Beta) ON, Join in Progress Behavior: Spawn Immediately), players sometimes spawn unable to walk forward, mostly when they join a match that is already running. They creep at about 1 cm/s and sprint won’t start, but strafing, jumping and crouching still work. Respawning with ESC > Respawn fixes it straight away.

Every time this happened, the client log shows the join stasis being queued on the local Newton pawn before its Chaos Mover has a Stasis mode. The warning LogChaosMover: Warning: Attempted to queue an unregistered movement mode: Stasis on owner PlayerPawn_Newton_C_… appears 13-42 times within about 2 seconds, interleaved with Not safe to respawn … due to incomplete streaming. Joins without that burst are fine.

This looks like the same bug as FORT-1128432, which was closed as not reproducible: Players intermittently get a high-gravity / cannot-move state on a physics-enabled island - persists across matches until Fortnite is restarted

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Character

Steps to Reproduce

  1. Use an island with Enable Physics (Beta) = ON, Join in Progress Behavior = Spawn Immediately and Spawn Location = Spawn Pads. My live island 3237-5655-5578 has these settings.
  2. Player A starts a match.
  3. Player B joins that running match as a join in progress, for example by leaving and rejoining the same server.
  4. B spawns while their level is still streaming, and the server applies the join stasis (Applied Stasis Mode [3]). In some of these joins (roughly 1 in 5-10), B’s client logs the burst of “unregistered movement mode: Stasis” warnings. From then on, B can’t walk forward.
  5. B presses ESC > Respawn, and movement is normal again.

Expected Result

A player who joins in progress can move normally after spawning.

Observed Result

  • Forward movement barely works (~1 cm/s) and sprinting doesn’t work either.
  • A/D/S, jump and crouch work.
  • It lasts until the player respawns.
  • Unlike the original thread, in my case a respawn is enough, no client restart is needed.

Platform(s)

All Platforms

Island Code

3237-5655-5578

Video

FORT-1192192 has been ‘Closed’ as a duplicate of an existing known issue. Origin Issue: FORT-1042630

FORT-1042630 has been added to our ‘To Do’ list. Someone’s been assigned this task.