Stale read from `<Match>`

[kasbah]

Encountered on next when messing about with a causal loop diagram and then navigating to "My documents". URL bar reads /documents but the page still shows the notebook. Hard to reproduce I think.

Uncaught (in promise) Error: Stale read from <Match>.
    wd solid.js:965
    th solid.js:978
    FT solid.js:709
    lc solid.js:677
    Wd solid.js:784
    Z5 solid.js:855
    BT solid.js:811
    Ni solid.js:801
    B solid.js:307
    O solid.js:302
    k solid.js:372
Caused by: "Stale read from <Match>."