Incorrect Latex parsing when subscript is on LHS

[repalash]

Description

If the subscript is on the left hand side of assignment, the output is incorrect

Steps to Reproduce

console.info(ce.parse("x_{y}\\coloneq z").json);
console.info(ce.parse("x\\coloneq z_{y}").json);

Actual Result

[
  "Assign", 
  "Subscript", 
  ["Function", "z", "x", "y"]
]
["Assign", "x", "z_y"]

Expected Result

["Assign", ["Subscript", "x", "y"], "z"]
["Assign", "x", ["Subscript", "z", "y"]]

Environment

Is this a regression: did it use to work in a previous version?

Tested on the website at https://cortexjs.io/compute-engine/demo/

When testing locally, I think that i got the result for 2nd correctly, but I am not sure which version that was as it was installed as a dependency of mathlive.

Compute Engine version If using the cortexjs.io site, the version is displayed
at the bottom of the page. If using the library, the version is available as
window[Symbol.for('io.cortexjs.compute-engine')].version in the browser or by importing
version from the library.

The website just shows {{SDK_VERSION}}