Created attachment 1887889 [details]
File: backtrace

Created attachment 1887890 [details]
File: core_backtrace

Created attachment 1887891 [details]
File: cpuinfo

Created attachment 1887892 [details]
File: dso_list

Created attachment 1887893 [details]
File: environ

Created attachment 1887894 [details]
File: exploitable

Created attachment 1887895 [details]
File: limits

Created attachment 1887896 [details]
File: maps

Created attachment 1887897 [details]
File: mountinfo

Created attachment 1887898 [details]
File: open_fds

Created attachment 1887899 [details]
File: proc_pid_status

(In reply to Mike FABIAN from comment #1)
> Created attachment 1887889 [details]
> File: backtrace

>   File "/usr/share/ibus/setup/enginedialog.py", line 181, in __padded_label_new
> Python Exception <class 'UnicodeDecodeError'>: 'ascii' codec can't decode byte 0xe2 in position 8098: ordinal not in range(128)
Error occurred in Python: 'ascii' codec can't decode byte 0xe2 in position 8098: ordinal not in range(128)
>  279                              ', '.join(arg_names[:len(args)]),

I cannot reproduce your issue.
Which locale did you run ibus-setup on?

Seems you open Input Method tab in ibus-setup and I guess you access U+00E2(â) in a language name.

This message is a reminder that Fedora Linux 36 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 36 on 2023-05-16.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '36'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, change the 'version' 
to a later Fedora Linux version. Note that the version field may be hidden.
Click the "Show advanced fields" button if you do not see it.

Thank you for reporting this issue and we are sorry that we were not 
able to fix it before Fedora Linux 36 is end of life. If you would still like 
to see this bug fixed and are able to reproduce it against a later version 
of Fedora Linux, you are encouraged to change the 'version' to a later version
prior to this bug being closed.

Seems you run ibus-setup with a wrong locale.

        label = Gtk.Label(label = text)

The label "Cameroon Multilingual (QWERTY, intl.)" does not include U+00E2 but your error indicates that code point at 8098 position.

(In reply to Mike FABIAN from comment #1)
> Created attachment 1887889 [details]
> File: backtrace

Python Exception <class 'UnicodeDecodeError'>: 'ascii' codec can't decode byte 0xe2 in position 8098: ordinal not in range(128)
Error occurred in Python: 'ascii' codec can't decode byte 0xe2 in position 8098: ordinal not in range(128)

#1  0x00007f710df1a89f in dict_merge (a=<error reading variable: Cannot access memory at address 0x20>, b={'label': 'Cameroon Multilingual (QWERTY, intl.)'}, override=1) at /usr/src/debug/python3.10-3.10.4-1.fc36.x86_64/Objects/dictobject.c:2588

#12 0x00007f710df31671 in _PyObject_Call_Prepend (kwargs={'label': 'Cameroon Multilingual (QWERTY, intl.)'}, args=(), obj=<optimized out>, callable=<function at remote 0x7f70ff0f6b00>, tstate=0x559098a8fae0) at /usr/src/debug/python3.10-3.10.4-1.fc36.x86_64/Objects/call.c:431

#21 0x00007f710df1d873 in _PyEval_EvalFrame (throwflag=0, f=Frame 0x7f7100435240, for file /usr/share/ibus/setup/enginedialog.py, line 181, in __padded_label_new (self=

I cannot reproduce this issue either at the moment.