0.84.3 :0:0 script error in regular HA - not Lovelace

Just updated to 0.84.3 for the weather component cards to show again.

On each focus to the browser-tab regular HA is running in there is this in the log. Lovelace HA shows without script error.

without any further hint as to how, why or what…
no matter which view I have HA on, so no matter the content of the Browser Tab.

does any one else see this?

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have you been able to fix it?