SUMMARY
I have noticed that Konsole does not trigger selection mode when something like "less" or "git log"(using less), or "htop" are running
maybe related to those programs using a alternative buffer?

STEPS TO REPRODUCE
1. have konsole open
2. run "less" on any file (or any of the other mentioned programs)
3. try to trigger selection mode (via CTRL+SHIFT+D)
4. observe that selection mode is not triggered (in "less" it behaves like if PGDOWN was pressed)

OBSERVED RESULT
Selection Mode not triggered in alternative buffer mode

EXPECTED RESULT
Selection Mode to start

SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 5.26.5
KDE Frameworks Version: 5.102.0
Qt Version: 5.15.8
Kernel Version: 6.1.7-1-MANJARO (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5800X 8-Core Processor
Memory: 15.5 GiB of RAM
Graphics Processor: AMD Radeon RX Vega
Manufacturer: ASUS

ADDITIONAL INFORMATION
less 608
git version 2.39.1
zsh 5.9 (x86_64-pc-linux-gnu)

for example "tmux" is able to trigger its selection mode in those programs

PS: i opened it in component "general" because i was not sure which other component to use, i considered "history", "copy-paste" and "keyboard"