trisquel 11 (and trisquel 12) lightdm logout me when I switch to tty 1-6

On the same computer (not in VM), I've debian 11, 12, 13, LMDE7 and lubuntu 18.04ESM

Only Trisquel 11 (and 12) logout me when I'm using tty 1 to 6 and come back to tty 7 for the graphical session.

System:
Host: tris Kernel: 5.15.0-161-generic x86_64 bits: 64 Desktop: LXDE 0.10.1
Distro: Trisquel GNU/Linux 11.0.1 Aramo
CPU:
Info: quad core Intel Core i3-9100F [MCP] speed (MHz): avg: 800
min/max: 800/4200
Graphics:
Device-1: AMD Ellesmere [Radeon RX 470/480/570/570X/580/580X/590]
driver: N/A
Display: x11 server: X.Org v: 1.21.1.4 driver: X: loaded: ati,vesa
unloaded: fbdev,modesetting,radeon gpu: N/A resolution: 2560x1080
OpenGL: renderer: llvmpipe (LLVM 15.0.7 256 bits)
v: 4.5 Mesa 23.2.1-1ubuntu3.1~22.04.3

Original installation via USB with netinstall
Basic installation - with no graphicals options or specifical options choosed
after as usually, via tty, I've installed
lxde, openbox, lightdm and classical desktop softwares : abrowser, icedove, libreoffice, nemo, gedit, mpv, mplayer, audacious, geany, transmission

Thanks for your help.