plasmashell crashes when using flexible panel spacer (32-bit)

I'm experiencing an issue where flexible panel spacers crash plasmashell. Static panel spacers are working as expected, but setting a spacer to be flexible, either programmatically or directly by changing the spacer's type to flexible from within the DE, casues a plasmashell crash that point directly to libQt5Qml-5.15.1 (qt5-declarative).

The twist is that this is only occurring on 32-bit archlinux32 platforms, but the same version of qt5-declarative running on the 64-bit archlinux platform is not displaying this behaviour.

This javascript code works on all platforms:

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panelSpacer = panel.addWidget("org.kde.plasma.panelspacer");
panelSpacer.writeConfig("expanding", "false");
panelSpacer.writeConfig("length", 32);

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But this only works on the 64-bit platform, crashing plasmashell on the 32-bit platform: {{}}

panelSpacer = panel.addWidget("org.kde.plasma.panelspacer");

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Also this (also crashes plasmashell on 32-bit arch32):

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 panelSpacer = panel.addWidget("org.kde.plasma.panelspacer"); panelSpacer.writeConfig("expanding", "true");

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I'm attaching the stack trace from the segfault.

plasmashell-stacktrace.txt}}{{