SUMMARY
A scroll back limit of 1000 lines is way too low for a default. Everyone I've whined to over the years agreed that the limit is too low and said to just set it to unlimited or raise it substantially. Let's do this globally. There is no practical reason I can think of why we'd have a limit this low. It only ever takes minutes to find a command with output that doesn't even fit inside the limit.

I propose we raise the limit to 1,000,000 and see how that goes.

An argument might even be made that unlimited is the way to go. It's kinda unexpected that output "randomly" disappears.
It may also make sense to equip konsole with kuserfeedback to get a sense of what configuration values get changed a lot.

STEPS TO REPRODUCE
1. run pw-dump

OBSERVED RESULT
half the output is not there

EXPECTED RESULT
a reasonable amount of output fits in the history

SOFTWARE/OS VERSIONS
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 5.27.80
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 5.15.0-58-generic (64-bit)
Graphics Platform: X11
Processors: 12 × AMD Ryzen 5 3600X 6-Core Processor
Memory: 31,3 GiB of RAM
Graphics Processor: AMD Radeon RX 5700 XT

ADDITIONAL INFORMATION