easyeffects causes `Could not wait for initialization: Connection timed out` when using `ao=pipewire`

Important Information

Provide following Information:

• mpv version

  mpv 0.35.0-445-g650c53df50 Copyright © 2000-2023 mpv/MPlayer/mplayer2 projects
   built on UNKNOWN
  libplacebo version: v5.264.0-296-g3df4e60d
  FFmpeg version: N-111095-g16fdb48e0d
  FFmpeg library versions:
     libavutil       58.13.101
     libavcodec      60.20.100
     libavformat     60.7.100
     libswscale      7.3.100
     libavfilter     9.8.102
     libswresample   4.11.100
  

• Source of the mpv binary
  AUR/mpv-full-git
• If known which version of mpv introduced the problem
  After release 0.35.1
• Window Manager and version
  KDE Plasma 5.27.5
• GPU driver and version
  NVIDIA 535.54.03
  mesa-git 23.2.0_devel.172839.13df91d7d7d.d41d8cd98f00b204e9800998ecf8427e-1
• pipewire 0.3.71
• wireplumber 0.4.14

Reproduction steps

enable easyeffects and play any audio with --ao=pipewire

Log file

mpv 0.35.1 in archlinux repo

[af] [in] 48000Hz stereo 2ch floatp
[af] [userspeed] 48000Hz stereo 2ch floatp
[af] [userspeed] (disabled)
[af] [convert] 48000Hz stereo 2ch floatp
[ao] Trying audio driver 'pipewire'
[ao/pipewire] requested format: 48000 Hz, stereo channels, floatp
[ao/pipewire] Headers version: 0.3.70
[ao/pipewire] Library version: 0.3.71
[ao/pipewire] Core user: brainos
[ao/pipewire] Core host: Brainos-LAPTOP
[ao/pipewire] Core version: 0.3.71
[ao/pipewire] Core name: pipewire-0
[ao/pipewire] device buffer: 960 samples.
[ao/pipewire] using soft-buffer of 9600 samples.
[cplayer] AO: [pipewire] 48000Hz stereo 2ch floatp
[cplayer] AO: Description: PipeWire audio output
[af] [convert] (disabled)
[af] [out] 48000Hz stereo 2ch floatp

mpv 0.35.0-445-g650c53df50

[af] [in] 48000Hz stereo 2ch floatp
[af] [userspeed] 48000Hz stereo 2ch floatp
[af] [userspeed] (disabled)
[af] [convert] 48000Hz stereo 2ch floatp
[ao] Trying audio driver 'pipewire'
[ao/pipewire] requested format: 48000 Hz, stereo channels, floatp
[ao/pipewire] Headers version: 0.3.71
[ao/pipewire] Library version: 0.3.71
[ao/pipewire] Core user: brainos
[ao/pipewire] Core host: Brainos-LAPTOP
[ao/pipewire] Core version: 0.3.71
[ao/pipewire] Core name: pipewire-0
[ao/pipewire] Could not wait for initialization: Connection timed out
[ao/pipewire] device buffer: 960 samples.
[ao/pipewire] using soft-buffer of 9600 samples.
[cplayer] AO: [pipewire] 48000Hz stereo 2ch floatp
[cplayer] AO: Description: PipeWire audio output
[af] [convert] (disabled)
[af] [out] 48000Hz stereo 2ch floatp

`[ao/pipewire] Could not wait for initialization: Connection timed out' only appears when easyeffects is enabled, but not when adding mpv to easyeffects' block list.

There are graph pipewire connections listed by qpwgraph.

mpv 0.35.0-445-g650c53df50, enable easyeffects

mpv 0.35.0-445-g650c53df50, block mpv in easyeffects

mpv 0.35.1 in archlinux repo, enable easyeffects

mpv 0.35.1 in archlinux repo, block mpv in easyeffects

And there's another problem, in mpv release 0.35.1, qpwgraph shows the media name and no need to restart. But git version will show as audio-src, media name will be shown only if qpwgraph is restarted.