Intermittent message in solbuild : Creating mailbox file: No such file or directory

Please confirm there isn't an existing open bug report

• I have searched open bugs for this issue

Summary

Sometime go-task build/solbuild build show this error message :
Creating mailbox file: No such file or directory

Steps to reproduce

1. Build some package

Expected result

No error message

Actual result

This error message show up:
Creating mailbox file: No such file or directory

Environment

• Is system up to date?

Repo

Unstable

Desktop Environment

Budgie

System details

System:
Host: solus-alfisya Kernel: 6.6.18-278.current arch: x86_64 bits: 64
Desktop: GNOME v: 45.4 Distro: Solus 4.5 resilience
Machine:
Type: Desktop Mobo: Wibtek model: H77-M v: V1.3 serial:
BIOS: American Megatrends v: 4.6.5 date: 09/03/2012
CPU:
Info: quad core Intel Core i5-3570K [MCP] speed (MHz): avg: 1596
min/max: 1600/3800
Graphics:
Device-1: AMD Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X]
driver: amdgpu v: kernel
Device-2: Jieli USB PHY 2.0 driver: snd-usb-audio,uvcvideo type: USB
Display: wayland server: X.Org v: 23.2.4 with: Xwayland v: 23.2.4
compositor: gnome-shell driver: gpu: amdgpu resolution: 1366x768~60Hz
API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 24.0.2 renderer: AMD
Radeon RX 550 / 550 Series (radeonsi polaris12 LLVM 16.0.6 DRM 3.54
6.6.18-278.current)
Network:
Device-1: Realtek RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet
driver: r8169
Device-2: Realtek RTL8192EE PCIe Wireless Network Adapter
driver: rtl8192ee
Device-3: Realtek RTL8188EUS 802.11n Wireless Network Adapter
driver: rtl8xxxu type: USB
Drives:
Local Storage: total: 700.51 GiB used: 138.93 GiB (19.8%)
Info:
Memory: total: 16 GiB available: 15.6 GiB used: 5.65 GiB (36.2%)
Processes: 307 Uptime: 3h 19m Shell: fish inxi: 3.3.33

Other comments

CC @ReillyBrogan . I couldn't actually assign anyone anything, you know?