What version of Codex CLI is running?
codex-cli 0.104.0
What subscription do you have?
Plus
Which model were you using?
gpt-5.3-codex
What platform is your computer?
Macos
What terminal emulator and version are you using (if applicable)?
Alacritty + tmux
What issue are you seeing?
If I maximize the tmux pane while codex is generating output, the output gets messed up and some text is not visible in the terminal history anymore.
What steps can reproduce the bug?
Type this in codex cli with alacritty + tmux:
output numbers from 1 to 200 slowly. I'm trying to debug codex cli
While it's generating output, maximize and minimize the pane repeatedly. After that, enable copy mode (scroll mode) and scroll up. You'll see something like this in the scrollback buffer:
↳ Interacted with background terminal · for i in {1..200}; do echo $i; sleep 0.15; done
└ (waited)
• 10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
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39
40
41
42
43
44
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48
49
50
51
52
53
54
55
56
57
58
59
↳ Interacted with background terminal · for i in {1..200}; do echo $i; sleep 0.15; done
└ (waited)
• 60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
125
126
127
128
129
130
131
132
133
134
↳ Interacted with background terminal · for i in {1..200}; do echo $i; sleep 0.15; done
└ (waited)
• Ran for i in {1..200}; do echo $i; sleep 0.15; done
└ 2
3
… +195 lines
199
200
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
• 135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
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170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
↳ Interacted with background terminal
└ (waited)
• 192
193
194
195
196
197
198
199
200
• Finished streaming 1 to 200 slowly.
Notice that some lines are missing.
What is the expected behavior?
Everything that the LLM outputs should be visible in the terminal. This bug messes up LLM output and makes it unreadable.
Additional information
No response
What version of Codex CLI is running?
codex-cli 0.104.0
What subscription do you have?
Plus
Which model were you using?
gpt-5.3-codex
What platform is your computer?
Macos
What terminal emulator and version are you using (if applicable)?
Alacritty + tmux
What issue are you seeing?
If I maximize the tmux pane while codex is generating output, the output gets messed up and some text is not visible in the terminal history anymore.
What steps can reproduce the bug?
Type this in codex cli with alacritty + tmux:
While it's generating output, maximize and minimize the pane repeatedly. After that, enable copy mode (scroll mode) and scroll up. You'll see something like this in the scrollback buffer:
Notice that some lines are missing.
What is the expected behavior?
Everything that the LLM outputs should be visible in the terminal. This bug messes up LLM output and makes it unreadable.
Additional information
No response