No tray icon in Plasma 5 in some circumstances

[dollhaus]

Plasma 5.27.5
Debian 12
Default plasma-desktop System Tray 1.0
Caprine 2.60.3

Caprine installed via .deb and dpkg.

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When Quit on window close is deselected, no tray icon for Caprine is shown. On closing the application, no tray icon appears. The application must be pkilled, as it correctly disappears from the taskbar.

This only occurs when the quit behaviour is changed while the application is open. After restarting the application, the tray icon appears as normal.