Uncaught TypeError: this.cachedValues.get(...).slice is not a function

[cor3ntin]

I stumbled upon the following error which makes scratch unusable for me

Uncaught TypeError: this.cachedValues.get(...).slice is not a function
    at Thymio.touchVal (lib.min.js:303246)
    at Thymio.notouching (lib.min.js:303278)
    at Scratch3ThymioBlocks.notouching (lib.min.js:304755)
    at execute (lib.min.js:289860)
    at Sequencer.stepThread (lib.min.js:293454)
    at Sequencer.stepThreads (lib.min.js:293356)
    at Runtime._step (lib.min.js:292110)
    at lib.min.js:292759

[pierre-rouanet]

From what I see it seems like the prox.horizontal cached variables is not an array and thus the slice method is not a found.

It could be try/catched on the extensions side but it's probably worth investigating why it happens in the first place.

[mbonani]

is this issue still present?