[Bug]: card-mod fails to load in Home Assistant 2026.2.0

[dcapslock]

My Home Assistant Version

Core: 2026.2.0b0
Card-mod: 4.2.0-beta.6

My lovelace configuration method

GUI

What I am doing

card-mod with theme which includes yaml config e.g. card-mod-card-yaml:

What I expect to happen

card-mod loads

What happened instead

card-mod does not load

Minimal steps to reproduce

1. Theme with any -yaml card-mod element

...

Include any yaml code here

Error messages from the browser console

Uncaught (in promise) TypeError: t.routerOptions.routes.tmp.load is not a function
    at card-mod.js?hacstag=97526870936031:1:52931
    at d (card-mod.js?hacstag=97526870936031:1:6540)
    at Generator.<anonymous> (card-mod.js?hacstag=97526870936031:1:7886)
    at Generator.next (card-mod.js?hacstag=97526870936031:1:6969)
    at j (card-mod.js?hacstag=97526870936031:1:12685)
    at a (card-mod.js?hacstag=97526870936031:1:12888)

By checking each box below I indicate that I ...

• Understand that this is a channel for reporting bugs, not a support forum (https://community.home-assistant.io/).
• Have made sure I am using the latest version of the plugin.
• Have followed the troubleshooting steps of the "Common Problems" section of https://github.com/thomasloven/hass-config/wiki/Lovelace-Plugins.
• Understand that failure to follow the template above may increase the time required to handle my bug-report, or cause it to be closed without further action.

[dcapslock]

Something has changed in Frontend so the way card-mod loads YAML to json has broken.

[dcapslock]

Card-mod 4.2.0-beta.7 available with fix.

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v4.2.0 released