Bug 466397

Created attachment 156703 [details]
Faint blue desktop wallpaper (its more prominent than it looks via spectacle) on which is the dolphin terminal panel showing a terminal window behind with `cd  /home/user` and the terminal's dimension

SUMMARY
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STEPS TO REPRODUCE
1. Open dolphin. (Super + E)
2. Open terminal panel (F4)

OBSERVED RESULT
The terminal panel seems to be showing a different terminal behind it with a glitchy transparency bug with its dimensions in the center and the glitch keeps showing both terminals. The glitch being the prompts appearing and then a clear terminal and then prompts reappearing again within a very short time, giving it a non uniform blinking effect.

EXPECTED RESULT
Normal terminal panel on dolphin with the prompt.

SOFTWARE/OS VERSIONS
Windows: -
macOS: -
Linux/KDE Plasma: Arch Linux 6.1.13-1-lts 5.27.1
(available in About System)
KDE Plasma Version: 5.27.1
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8

ADDITIONAL INFORMATION
Graphics Platform: Wayland
Prompt: oh-my-zsh

This bug does not happen with a standalone konsole window (with or without tabs). Just inside dolphin.
The interactive part of the terminal is glitchy(rapid blinking), shows the prompt but it seems its being cleared instantly and displayed again. And there's another prompt behind it with a same sized terminal with the command and all the characters: `$/home/user/^J clear^J` and also shows its dimensions in a box in the center of the terminal.
I can see the command prompt behind the interactive command prompt as the glitch blinking occurs, hence I'm sure there's two terminals.
Behind both of these terminals is the desktop or whatever window is behind dolphin.
Before updating to 5.27 it was normal, just opened up a terminal panel in the bottom part of dolphin.
I disabled oh-my-zsh to go back to bash terminal, to no avail. It still glitches.