connecting to 2 phones

[konn-neko]

• [🗸] I have read the FAQ.
• [🗸] I have searched in existing issues.

Environment

• OS: Win 10 64 bit
• scrcpy version: 1.20
• installation method: windows release
• device model: motorola moto e5 play (Android 8.0.0) and TINNO U304AC (Android 9)
• Android version: 8 and 9

Describe the bug
When I want to connect to 2 phones, it wont let me, screenshot down below

C:\Users\fortw\Downloads\scrcpy>scrcpy -s ZY323HL4WT
INFO: scrcpy 1.20 <https://github.com/Genymobile/scrcpy>
C:\Users\fortw\Downloads\scrcpy\scrcpy-server:..., 0 skipped. 35.2 MB/s (37139 bytes in 0.001s)
[server] INFO: Device: motorola moto e5 play (Android 8.0.0)
INFO: Renderer: direct3d
INFO: Initial texture: 720x1280

C:\Users\fortw\Downloads\scrcpy>scrcpy -s LNAAGUZ9DE9LD6JJ
INFO: scrcpy 1.20 <https://github.com/Genymobile/scrcpy>
C:\Users\fortw\Downloads\scrcpy\scrcpy-server:..., 0 skipped. 31.6 MB/s (37139 bytes in 0.001s)
[server] INFO: Device: TINNO U304AC (Android 9)

[ANDImur]

#2779

[rom1v]

Use v1.21.