FX opt autocompletion behaving oddly with panslicer's 'probability:'

[ethancrawford]

When typing out the first few letters of the name of a synth, sample or fx opt, Sonic Pi is usually able to show you a list of potential opt names that match the partial name you have typed.
However, this list of potentially matching opt names does not seem to display correctly if you are attempting to add the probability: opt to the panslicer: fx. Instead, it seems to flicker on and then immediately disappear.
I am not sure why.
Seen here is an example reproduced with the latest MacOS release, v3.3.1.

[ethancrawford]

Curiously, the probability: opt of the slicer: fx is displayed and can be selected from the autocompleting list just fine.

[ethancrawford]

Even more curiously, I happened to notice just now that while the above observations still hold, the slicer: fx in fact has the reverse problem - prob_pos: disappears, but probability: works! 🤷‍♂️

[ethancrawford]

Have also seen that :octaver has what I assume to be the same problem with sub_amp:.