Chat log is cleared when many messages are received at once

[progval]

Describe the bug

When Nheko receives many messages at once (or, more likely, while a computer is suspended)

To Reproduce

1. Join a chat room
2. Send a SIGSTOP to Nheko (to emulate the computer being suspended or hibernated)
3. Send 11 or more messages to the room from a different user
4. Send SIGCONT to Nheko (to emulate the computer resuming)

What happened?

Chatlog of the current room is gone, scrolling up does nothing

Expected behavior

all messages should be displayed

Screenshots

seen from Eleweb:

seen from Nheko (suspended between "oh no" and "a"):

Version

0.11.3-2 (from Debian 12)

Operating system

Linux

Installation method

Some repository (AUR, homebrew, distribution repository, PPA, etc)

Qt version

5.15.8

C++ compiler

No response

Desktop Environment

Sway 1.7-6, Wayland 1.21.0-1

Did you use profiles?

• [ ] Profiles used?

Relevant log output

No response

Backtrace

No response

[progval]

(btw my server is Conduit's next branch)