1.4.3 - batch convert - Extract channel extracts nonexisting Alpha

[user0]

XnViewMP 1.4.3 64bit
Windows11 (22H2), display resolution 3840x2160, win scaling 150%

Batch convert
'Extract channel' extracts nonexisting Alpha

To reproduce:
1. run clean portable XnViewMP
2. open any image without Alpha channel*
3. press CTRL+U to open Batch convert
4. add 'Extract channel' action
- set Alpha channel
preview will show some data (same as Red channel)

* no bug on 8bit png

[xnview]

Thanks to your detailed description I can reproduce

[xnview]

See issue for current status and some details.

[xnview]

This problem is supposed to be fixed in XnView MP 1.5.0 beta. Please check and confirm the bug fix here.

[user0]

fixed in 1.5.0b1